diff --git a/background.js b/background.js
index 793b0af..0515f6f 100644
--- a/background.js
+++ b/background.js
@@ -1,10 +1,10 @@
 chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
-    if (changeInfo.status === "complete" && /^https?:/.test(tab.url)) {
+    if (changeInfo.status === 'complete' && /^https?:/.test(tab.url)) {
         chrome.scripting.executeScript({
             target: { tabId },
-            files: ["main.js"]
+            files: ['main.js']
         }).catch(err => {
-            console.warn("Injection failed:", err);
+            console.warn('Injection failed:', err);
         });
     }
 });
\ No newline at end of file
diff --git a/eslint.config.mjs b/eslint.config.mjs
new file mode 100644
index 0000000..506cc8f
--- /dev/null
+++ b/eslint.config.mjs
@@ -0,0 +1,31 @@
+import globals from 'globals';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import js from '@eslint/js';
+import { FlatCompat } from '@eslint/eslintrc';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+    baseDirectory: __dirname,
+    recommendedConfig: js.configs.recommended,
+    allConfig: js.configs.all
+});
+
+export default [...compat.extends('eslint:recommended'), {
+    languageOptions: {
+        globals: {
+            ...globals.browser,
+            ...globals.webextensions,
+            chrome: 'readonly',
+        },
+
+        ecmaVersion: 12,
+        sourceType: 'module',
+    },
+
+    rules: {
+        semi: ['error', 'always'],
+        quotes: ['error', 'single'],
+    },
+}];
\ No newline at end of file
diff --git a/main.js b/main.js
index 55d5190..2137884 100644
--- a/main.js
+++ b/main.js
@@ -2,20 +2,54 @@ let currentLists = [];
 let isGlobalHighlightEnabled = true;
 let matchCase = false;
 let matchWhole = false;
+let styleSheet = null;
+let wordStyleMap = new Map();
 
 function escapeRegex(s) {
-  return s.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+  return s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+function initializeStyleSheet() {
+  if (!styleSheet) {
+    const style = document.createElement('style');
+    style.id = 'goose-highlighter-styles';
+    document.head.appendChild(style);
+    styleSheet = style.sheet;
+  }
+}
+
+function updateWordStyles(activeWords) {
+  initializeStyleSheet();
+  
+  while (styleSheet.cssRules.length > 0) {
+    styleSheet.deleteRule(0);
+  }
+  
+  wordStyleMap.clear();
+  const uniqueStyles = new Map();
+  
+  for (const word of activeWords) {
+    const styleKey = `${word.background}-${word.foreground}`;
+    if (!uniqueStyles.has(styleKey)) {
+      const className = `highlighted-word-${uniqueStyles.size}`;
+      uniqueStyles.set(styleKey, className);
+      
+      const rule = `.${className} { background: ${word.background}; color: ${word.foreground}; padding: 0 2px; }`;
+      styleSheet.insertRule(rule, styleSheet.cssRules.length);
+    }
+    
+    const lookup = matchCase ? word.text : word.text.toLowerCase();
+    wordStyleMap.set(lookup, uniqueStyles.get(styleKey));
+  }
 }
 
 function clearHighlights() {
-  // Remove all <mark> elements added by the highlighter
-  const marks = document.querySelectorAll('mark[data-gh]');
-  for (const mark of marks) {
-    // Replace the <mark> with its text content
-    const parent = mark.parentNode;
+  const highlightedElements = document.querySelectorAll('[data-gh]');
+  for (const element of highlightedElements) {
+    const parent = element.parentNode;
     if (parent) {
-      parent.replaceChild(document.createTextNode(mark.textContent), mark);
-      parent.normalize(); // Merge adjacent text nodes
+      parent.replaceChild(document.createTextNode(element.textContent), element);
+      parent.normalize();
     }
   }
 }
@@ -25,7 +59,6 @@ function processNodes() {
   observer.disconnect();
   clearHighlights();
 
-  // If global highlighting is disabled, skip processing
   if (!isGlobalHighlightEnabled) {
     observer.observe(document.body, {
       childList: true,
@@ -38,7 +71,7 @@ function processNodes() {
   const textNodes = [];
   const walker = document.createTreeWalker(document.body, NodeFilter.SHOW_TEXT, {
     acceptNode: node => {
-      if (node.parentNode && node.parentNode.nodeName === 'MARK') return NodeFilter.FILTER_REJECT;
+      if (node.parentNode && node.parentNode.hasAttribute('data-gh')) return NodeFilter.FILTER_REJECT;
       if (node.parentNode && ['SCRIPT', 'STYLE', 'NOSCRIPT', 'IFRAME'].includes(node.parentNode.nodeName)) return NodeFilter.FILTER_REJECT;
       if (!node.nodeValue.trim()) return NodeFilter.FILTER_SKIP;
       return NodeFilter.FILTER_ACCEPT;
@@ -61,6 +94,8 @@ function processNodes() {
   }
 
 if (activeWords.length > 0) {
+  updateWordStyles(activeWords);
+  
   const wordMap = new Map();
   for (const word of activeWords) {
     wordMap.set(matchCase ? word.text : word.text.toLowerCase(), word);
@@ -82,14 +117,14 @@ if (activeWords.length > 0) {
       const span = document.createElement('span');
       span.innerHTML = node.nodeValue.replace(pattern, match => {
         const lookup = matchCase ? match : match.toLowerCase();
-        const word = wordMap.get(lookup) || { background: '#ffff00', foreground: '#000000' };
-        return `<mark data-gh style="background:${word.background};color:${word.foreground};padding:0 2px;">${match}</mark>`;
+        const className = wordStyleMap.get(lookup) || 'highlighted-word-0';
+        return `<span data-gh class="${className}">${match}</span>`;
       });
 
       node.parentNode.replaceChild(span, node);
     }
   } catch (e) {
-    console.error("Regex error:", e);
+    console.error('Regex error:', e);
   }
 }
 
@@ -107,7 +142,6 @@ function setListsAndUpdate(lists) {
   debouncedProcessNodes();
 }
 
-// Debounce helper function
 function debounce(func, wait) {
   let timeout;
   return function () {
@@ -118,7 +152,7 @@ function debounce(func, wait) {
 }
 
 // Initial highlight on load
-chrome.storage.local.get(["lists", "globalHighlightEnabled", "matchCaseEnabled", "matchWholeEnabled"], ({ lists, globalHighlightEnabled, matchCaseEnabled, matchWholeEnabled }) => {
+chrome.storage.local.get(['lists', 'globalHighlightEnabled', 'matchCaseEnabled', 'matchWholeEnabled'], ({ lists, globalHighlightEnabled, matchCaseEnabled, matchWholeEnabled }) => {
   if (Array.isArray(lists)) setListsAndUpdate(lists);
   if (globalHighlightEnabled !== undefined) {
     isGlobalHighlightEnabled = globalHighlightEnabled;
@@ -129,15 +163,15 @@ chrome.storage.local.get(["lists", "globalHighlightEnabled", "matchCaseEnabled",
 });
 
 // Listen for updates from the popup and re-apply highlights
-chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
-  if (message.type === "WORD_LIST_UPDATED") {
-    chrome.storage.local.get("lists", ({ lists }) => {
+chrome.runtime.onMessage.addListener((message) => {
+  if (message.type === 'WORD_LIST_UPDATED') {
+    chrome.storage.local.get('lists', ({ lists }) => {
       if (Array.isArray(lists)) setListsAndUpdate(lists);
     });
-  } else if (message.type === "GLOBAL_TOGGLE_UPDATED") {
+  } else if (message.type === 'GLOBAL_TOGGLE_UPDATED') {
     isGlobalHighlightEnabled = message.enabled;
     processNodes();
-  } else if (message.type === "MATCH_OPTIONS_UPDATED") {
+  } else if (message.type === 'MATCH_OPTIONS_UPDATED') {
     matchCase = !!message.matchCase;
     matchWhole = !!message.matchWhole;
     processNodes();
diff --git a/package-lock.json b/package-lock.json
index a1f94cd..76258ac 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,9 +5,13 @@
   "packages": {
     "": {
       "devDependencies": {
+        "@eslint/css": "^0.9.0",
+        "@eslint/js": "^9.30.0",
         "@semantic-release/changelog": "^6.0.3",
         "@semantic-release/exec": "^7.1.0",
         "@semantic-release/git": "^10.0.1",
+        "eslint": "^9.30.0",
+        "globals": "^16.2.0",
         "semantic-release": "^24.2.5"
       }
     },
@@ -47,6 +51,291 @@
         "node": ">=0.1.90"
       }
     },
+    "node_modules/@eslint-community/eslint-utils": {
+      "version": "4.7.0",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.7.0.tgz",
+      "integrity": "sha512-dyybb3AcajC7uha6CvhdVRJqaKyn7w2YKqKyAN37NKYgZT36w+iRb0Dymmc5qEJ549c/S31cMMSFd75bteCpCw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "eslint-visitor-keys": "^3.4.3"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      },
+      "peerDependencies": {
+        "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
+      }
+    },
+    "node_modules/@eslint-community/eslint-utils/node_modules/eslint-visitor-keys": {
+      "version": "3.4.3",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-3.4.3.tgz",
+      "integrity": "sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
+    "node_modules/@eslint-community/regexpp": {
+      "version": "4.12.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.1.tgz",
+      "integrity": "sha512-CCZCDJuduB9OUkFkY2IgppNZMi2lBQgD2qzwXkEia16cge2pijY/aXi96CJMquDMn3nJdlPV1A5KrJEXwfLNzQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^12.0.0 || ^14.0.0 || >=16.0.0"
+      }
+    },
+    "node_modules/@eslint/config-array": {
+      "version": "0.21.0",
+      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.21.0.tgz",
+      "integrity": "sha512-ENIdc4iLu0d93HeYirvKmrzshzofPw6VkZRKQGe9Nv46ZnWUzcF1xV01dcvEg/1wXUR61OmmlSfyeyO7EvjLxQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@eslint/object-schema": "^2.1.6",
+        "debug": "^4.3.1",
+        "minimatch": "^3.1.2"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/config-helpers": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.3.0.tgz",
+      "integrity": "sha512-ViuymvFmcJi04qdZeDc2whTHryouGcDlaxPqarTD0ZE10ISpxGUVZGZDx4w01upyIynL3iu6IXH2bS1NhclQMw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/core": {
+      "version": "0.14.0",
+      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-0.14.0.tgz",
+      "integrity": "sha512-qIbV0/JZr7iSDjqAc60IqbLdsj9GDt16xQtWD+B78d/HAlvysGdZZ6rpJHGAc2T0FQx1X6thsSPdnoiGKdNtdg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@types/json-schema": "^7.0.15"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/css": {
+      "version": "0.9.0",
+      "resolved": "https://registry.npmjs.org/@eslint/css/-/css-0.9.0.tgz",
+      "integrity": "sha512-fq8hYnjipdzVDSU/bXqv7qlvdjDA27Nq7DhQXzlPElLlVon3lnKovIM/6HaUrq1bz7EPgRobr+vOhpeM6z0X4w==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@eslint/core": "^0.14.0",
+        "@eslint/css-tree": "^3.6.1",
+        "@eslint/plugin-kit": "^0.3.1"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/css-tree": {
+      "version": "3.6.1",
+      "resolved": "https://registry.npmjs.org/@eslint/css-tree/-/css-tree-3.6.1.tgz",
+      "integrity": "sha512-5DIsBME23tUQD5zHD+T38lC2DG4jB8x8JRa+yDncLne2TIZA0VuCpcSazOX1EC+sM/q8w24qeevXfmfsIxAeqA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "mdn-data": "2.21.0",
+        "source-map-js": "^1.0.1"
+      },
+      "engines": {
+        "node": "^10 || ^12.20.0 || ^14.13.0 || >=15.0.0"
+      }
+    },
+    "node_modules/@eslint/eslintrc": {
+      "version": "3.3.1",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-3.3.1.tgz",
+      "integrity": "sha512-gtF186CXhIl1p4pJNGZw8Yc6RlshoePRvE0X91oPGb3vZ8pM3qOS9W9NGPat9LziaBV7XrJWGylNQXkGcnM3IQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ajv": "^6.12.4",
+        "debug": "^4.3.2",
+        "espree": "^10.0.1",
+        "globals": "^14.0.0",
+        "ignore": "^5.2.0",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^4.1.0",
+        "minimatch": "^3.1.2",
+        "strip-json-comments": "^3.1.1"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
+    "node_modules/@eslint/eslintrc/node_modules/globals": {
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/@eslint/eslintrc/node_modules/ignore": {
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/ignore/-/ignore-5.3.2.tgz",
+      "integrity": "sha512-hsBTNUqQTDwkWtcdYI2i06Y/nUBEsNEDJKjWdigLvegy8kDuJAS8uRlpkkcQpyEXL0Z/pjDy5HBmMjRCJ2gq+g==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 4"
+      }
+    },
+    "node_modules/@eslint/eslintrc/node_modules/strip-json-comments": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/@eslint/js": {
+      "version": "9.30.0",
+      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.30.0.tgz",
+      "integrity": "sha512-Wzw3wQwPvc9sHM+NjakWTcPx11mbZyiYHuwWa/QfZ7cIRX7WK54PSk7bdyXDaoaopUcMatv1zaQvOAAO8hCdww==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://eslint.org/donate"
+      }
+    },
+    "node_modules/@eslint/object-schema": {
+      "version": "2.1.6",
+      "resolved": "https://registry.npmjs.org/@eslint/object-schema/-/object-schema-2.1.6.tgz",
+      "integrity": "sha512-RBMg5FRL0I0gs51M/guSAj5/e14VQ4tpZnQNWwuDT66P14I43ItmPfIZRhO9fUVIPOAQXU47atlywZ/czoqFPA==",
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+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/plugin-kit": {
+      "version": "0.3.3",
+      "resolved": "https://registry.npmjs.org/@eslint/plugin-kit/-/plugin-kit-0.3.3.tgz",
+      "integrity": "sha512-1+WqvgNMhmlAambTvT3KPtCl/Ibr68VldY2XY40SL1CE0ZXiakFR/cbTspaF5HsnpDMvcYYoJHfl4980NBjGag==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@eslint/core": "^0.15.1",
+        "levn": "^0.4.1"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/plugin-kit/node_modules/@eslint/core": {
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+      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-0.15.1.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@types/json-schema": "^7.0.15"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@humanfs/core": {
+      "version": "0.19.1",
+      "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.1.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18.0"
+      }
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+      "resolved": "https://registry.npmjs.org/@humanfs/node/-/node-0.16.6.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@humanfs/core": "^0.19.1",
+        "@humanwhocodes/retry": "^0.3.0"
+      },
+      "engines": {
+        "node": ">=18.18.0"
+      }
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+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
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+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=12.22"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
+    "node_modules/@humanwhocodes/retry": {
+      "version": "0.4.3",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/retry/-/retry-0.4.3.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/nzakas"
+      }
+    },
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+    "node_modules/file-entry-cache": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-8.0.0.tgz",
+      "integrity": "sha512-XXTUwCvisa5oacNGRP9SfNtYBNAMi+RPwBFmblZEF7N7swHYQS6/Zfk7SRwx4D5j3CH211YNRco1DEMNVfZCnQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "flat-cache": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=16.0.0"
+      }
+    },
     "node_modules/fill-range": {
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.1.1.tgz",
@@ -1832,6 +2524,27 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/flat-cache": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/flat-cache/-/flat-cache-4.0.1.tgz",
+      "integrity": "sha512-f7ccFPK3SXFHpx15UIGyRJ/FJQctuKZ0zVuN3frBo4HnK3cay9VEW0R6yPYFHC0AgqhukPzKjq22t5DmAyqGyw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "flatted": "^3.2.9",
+        "keyv": "^4.5.4"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
+    "node_modules/flatted": {
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.3.3.tgz",
+      "integrity": "sha512-GX+ysw4PBCz0PzosHDepZGANEuFCMLrnRTiEy9McGjmkCQYwRq4A/X786G/fjM/+OjsWSU1ZrY5qyARZmO/uwg==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/from2": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/from2/-/from2-2.3.0.tgz",
@@ -1922,6 +2635,19 @@
         "node": ">= 6"
       }
     },
+    "node_modules/globals": {
+      "version": "16.2.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-16.2.0.tgz",
+      "integrity": "sha512-O+7l9tPdHCU320IigZZPj5zmRCFG9xHmx9cU8FqU2Rp+JN714seHV+2S9+JslCpY4gJwU2vOGox0wzgae/MCEg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/globby": {
       "version": "14.1.0",
       "resolved": "https://registry.npmjs.org/globby/-/globby-14.1.0.tgz",
@@ -2131,6 +2857,16 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/imurmurhash": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/imurmurhash/-/imurmurhash-0.1.4.tgz",
+      "integrity": "sha512-JmXMZ6wuvDmLiHEml9ykzqO6lwFbof0GG4IkcGaENdCRDDmMVnny7s5HsIgHCbaq0w2MyPhDqkhTUgS2LU2PHA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.8.19"
+      }
+    },
     "node_modules/indent-string": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/indent-string/-/indent-string-4.0.0.tgz",
@@ -2345,6 +3081,13 @@
         "js-yaml": "bin/js-yaml.js"
       }
     },
+    "node_modules/json-buffer": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/json-buffer/-/json-buffer-3.0.1.tgz",
+      "integrity": "sha512-4bV5BfR2mqfQTJm+V5tPPdf+ZpuhiIvTuAB5g8kcrXOZpTT/QwwVRWBywX1ozr6lEuPdbHxwaJlm9G6mI2sfSQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/json-parse-better-errors": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/json-parse-better-errors/-/json-parse-better-errors-1.0.2.tgz",
@@ -2359,6 +3102,20 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/json-schema-traverse": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
+      "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/json-stable-stringify-without-jsonify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/json-stable-stringify-without-jsonify/-/json-stable-stringify-without-jsonify-1.0.1.tgz",
+      "integrity": "sha512-Bdboy+l7tA3OGW6FjyFHWkP5LuByj1Tk33Ljyq0axyzdk9//JSi2u3fP1QSmd1KNwq6VOKYGlAu87CisVir6Pw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/jsonfile": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-6.1.0.tgz",
@@ -2372,6 +3129,30 @@
         "graceful-fs": "^4.1.6"
       }
     },
+    "node_modules/keyv": {
+      "version": "4.5.4",
+      "resolved": "https://registry.npmjs.org/keyv/-/keyv-4.5.4.tgz",
+      "integrity": "sha512-oxVHkHR/EJf2CNXnWxRLW6mg7JyCCUcG0DtEGmL2ctUo1PNTin1PUil+r/+4r5MpVgC/fn1kjsx7mjSujKqIpw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "json-buffer": "3.0.1"
+      }
+    },
+    "node_modules/levn": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",
+      "integrity": "sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "prelude-ls": "^1.2.1",
+        "type-check": "~0.4.0"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/lines-and-columns": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.2.4.tgz",
@@ -2465,6 +3246,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/lodash.merge": {
+      "version": "4.6.2",
+      "resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.2.tgz",
+      "integrity": "sha512-0KpjqXRVvrYyCsX1swR/XTK0va6VQkQM6MNo7PqW77ByjAhoARA8EfrP1N4+KlKj8YS0ZUCtRT/YUuhyYDujIQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/lodash.uniqby": {
       "version": "4.7.0",
       "resolved": "https://registry.npmjs.org/lodash.uniqby/-/lodash.uniqby-4.7.0.tgz",
@@ -2514,6 +3302,13 @@
         "marked": ">=1 <16"
       }
     },
+    "node_modules/mdn-data": {
+      "version": "2.21.0",
+      "resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-2.21.0.tgz",
+      "integrity": "sha512-+ZKPQezM5vYJIkCxaC+4DTnRrVZR1CgsKLu5zsQERQx6Tea8Y+wMx5A24rq8A8NepCeatIQufVAekKNgiBMsGQ==",
+      "dev": true,
+      "license": "CC0-1.0"
+    },
     "node_modules/meow": {
       "version": "13.2.0",
       "resolved": "https://registry.npmjs.org/meow/-/meow-13.2.0.tgz",
@@ -2584,6 +3379,19 @@
         "node": ">=6"
       }
     },
+    "node_modules/minimatch": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
+      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "brace-expansion": "^1.1.7"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/minimist": {
       "version": "1.2.8",
       "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.8.tgz",
@@ -2613,6 +3421,13 @@
         "thenify-all": "^1.0.0"
       }
     },
+    "node_modules/natural-compare": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/natural-compare/-/natural-compare-1.4.0.tgz",
+      "integrity": "sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/neo-async": {
       "version": "2.6.2",
       "resolved": "https://registry.npmjs.org/neo-async/-/neo-async-2.6.2.tgz",
@@ -5484,6 +6299,24 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/optionator": {
+      "version": "0.9.4",
+      "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.4.tgz",
+      "integrity": "sha512-6IpQ7mKUxRcZNLIObR0hz7lxsapSSIYNZJwXPGeF0mTVqGKFIXj1DQcMoT22S3ROcLyY/rz0PWaWZ9ayWmad9g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "deep-is": "^0.1.3",
+        "fast-levenshtein": "^2.0.6",
+        "levn": "^0.4.1",
+        "prelude-ls": "^1.2.1",
+        "type-check": "^0.4.0",
+        "word-wrap": "^1.2.5"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/p-each-series": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/p-each-series/-/p-each-series-3.0.0.tgz",
@@ -5725,6 +6558,16 @@
         "node": ">=4"
       }
     },
+    "node_modules/prelude-ls": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
+      "integrity": "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/pretty-ms": {
       "version": "9.2.0",
       "resolved": "https://registry.npmjs.org/pretty-ms/-/pretty-ms-9.2.0.tgz",
@@ -5755,6 +6598,16 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/punycode": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
+      "integrity": "sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/queue-microtask": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/queue-microtask/-/queue-microtask-1.2.3.tgz",
@@ -6415,6 +7268,16 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/source-map-js": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
+      "integrity": "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/spawn-error-forwarder": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/spawn-error-forwarder/-/spawn-error-forwarder-1.0.0.tgz",
@@ -6735,6 +7598,19 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/type-check": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+      "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "prelude-ls": "^1.2.1"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/type-fest": {
       "version": "4.41.0",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-4.41.0.tgz",
@@ -6818,6 +7694,16 @@
         "node": ">= 10.0.0"
       }
     },
+    "node_modules/uri-js": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "punycode": "^2.1.0"
+      }
+    },
     "node_modules/url-join": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/url-join/-/url-join-5.0.0.tgz",
@@ -6862,6 +7748,16 @@
         "node": ">= 8"
       }
     },
+    "node_modules/word-wrap": {
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
+      "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -6936,6 +7832,19 @@
         "node": ">=12"
       }
     },
+    "node_modules/yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/yoctocolors": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/yoctocolors/-/yoctocolors-2.1.1.tgz",
diff --git a/package.json b/package.json
index 2248fe5..f7e87fa 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,12 @@
 {
   "devDependencies": {
+    "@eslint/css": "^0.9.0",
+    "@eslint/js": "^9.30.0",
     "@semantic-release/changelog": "^6.0.3",
     "@semantic-release/exec": "^7.1.0",
     "@semantic-release/git": "^10.0.1",
+    "eslint": "^9.30.0",
+    "globals": "^16.2.0",
     "semantic-release": "^24.2.5"
   },
   "scripts": {
diff --git a/popup/popup.js b/popup/popup.js
index 76932ca..c89855d 100644
--- a/popup/popup.js
+++ b/popup/popup.js
@@ -1,19 +1,18 @@
-const listSelect = document.getElementById("listSelect");
-const listName = document.getElementById("listName");
-const listBg = document.getElementById("listBg");
-const listFg = document.getElementById("listFg");
-const listActive = document.getElementById("listActive");
-const bulkPaste = document.getElementById("bulkPaste");
-const wordList = document.getElementById("wordList");
-const importInput = document.getElementById("importInput");
-const matchCase = document.getElementById("matchCase");
-const matchWhole = document.getElementById("matchWhole");
+const listSelect = document.getElementById('listSelect');
+const listName = document.getElementById('listName');
+const listBg = document.getElementById('listBg');
+const listFg = document.getElementById('listFg');
+const listActive = document.getElementById('listActive');
+const bulkPaste = document.getElementById('bulkPaste');
+const wordList = document.getElementById('wordList');
+const importInput = document.getElementById('importInput');
+const matchCase = document.getElementById('matchCase');
+const matchWhole = document.getElementById('matchWhole');
 let lists = [];
 let currentListIndex = 0;
-let saveTimeout;
 let selectedCheckboxes = new Set();
 let globalHighlightEnabled = true;
-let wordSearchQuery = "";
+let wordSearchQuery = '';
 let matchCaseEnabled = false;
 let matchWholeEnabled = false;
 
@@ -24,18 +23,11 @@ function escapeHtml(str) {
       '<': '&lt;',
       '>': '&gt;',
       '"': '&quot;',
-      "'": '&#39;'
+      '\'': '&#39;'
     })[m];
   });
 }
 
-async function debouncedSave() {
-  clearTimeout(saveTimeout);
-  saveTimeout = setTimeout(async () => {
-    await chrome.storage.local.set({ lists });
-  }, 500);
-}
-
 async function save() {
   await chrome.storage.local.set({
     lists: lists,
@@ -49,13 +41,13 @@ async function save() {
   chrome.tabs.query({}, function (tabs) {
     for (let tab of tabs) {
       if (tab.id) {
-        chrome.tabs.sendMessage(tab.id, { type: "WORD_LIST_UPDATED" });
+        chrome.tabs.sendMessage(tab.id, { type: 'WORD_LIST_UPDATED' });
         chrome.tabs.sendMessage(tab.id, {
-          type: "GLOBAL_TOGGLE_UPDATED",
+          type: 'GLOBAL_TOGGLE_UPDATED',
           enabled: globalHighlightEnabled
         });
         chrome.tabs.sendMessage(tab.id, {
-          type: "MATCH_OPTIONS_UPDATED",
+          type: 'MATCH_OPTIONS_UPDATED',
           matchCase: matchCaseEnabled,
           matchWhole: matchWholeEnabled
         });
@@ -70,7 +62,7 @@ async function updateGlobalToggleState() {
     for (let tab of tabs) {
       if (tab.id) {
         chrome.tabs.sendMessage(tab.id, {
-          type: "GLOBAL_TOGGLE_UPDATED",
+          type: 'GLOBAL_TOGGLE_UPDATED',
           enabled: globalHighlightEnabled
         });
       }
@@ -95,9 +87,9 @@ async function load() {
   if (!lists.length) {
     lists.push({
       id: Date.now(),
-      name: chrome.i18n.getMessage("default_list_name"),
-      background: "#ffff00",
-      foreground: "#000000",
+      name: chrome.i18n.getMessage('default_list_name'),
+      background: '#ffff00',
+      foreground: '#000000',
       active: true,
       words: []
     });
@@ -105,13 +97,13 @@ async function load() {
   renderLists();
   renderWords();
 
-  document.getElementById("globalHighlightToggle").checked = globalHighlightEnabled;
+  document.getElementById('globalHighlightToggle').checked = globalHighlightEnabled;
 }
 
 function renderLists() {
   listSelect.innerHTML = lists.map((list, index) =>
     `<option value="${index}">${escapeHtml(list.name)}</option>`
-  ).join("");
+  ).join('');
   listSelect.value = currentListIndex;
   updateListForm();
 }
@@ -152,7 +144,7 @@ function renderWords() {
   for (let i = startIndex; i < endIndex; i++) {
     const w = filteredWords[i];
     if (!w) continue;
-    const container = document.createElement("div");
+    const container = document.createElement('div');
     container.style.height = `${itemHeight}px`;
     container.style.position = 'absolute';
     container.style.top = `${i * itemHeight}px`;
@@ -169,16 +161,16 @@ function renderWords() {
 
     const realIndex = list.words.indexOf(w);
 
-    const cbSelect = document.createElement("input");
-    cbSelect.type = "checkbox";
-    cbSelect.className = "word-checkbox";
+    const cbSelect = document.createElement('input');
+    cbSelect.type = 'checkbox';
+    cbSelect.className = 'word-checkbox';
     cbSelect.dataset.index = realIndex;
     if (selectedCheckboxes.has(realIndex)) {
       cbSelect.checked = true;
     }
 
-    const inputWord = document.createElement("input");
-    inputWord.type = "text";
+    const inputWord = document.createElement('input');
+    inputWord.type = 'text';
     inputWord.value = w.wordStr;
     inputWord.dataset.wordEdit = realIndex;
     inputWord.style.flexGrow = '1';
@@ -189,34 +181,34 @@ function renderWords() {
     inputWord.style.backgroundColor = 'var(--input-bg)';
     inputWord.style.color = 'var(--text-color)';
 
-    const inputBg = document.createElement("input");
-    inputBg.type = "color";
+    const inputBg = document.createElement('input');
+    inputBg.type = 'color';
     inputBg.value = w.background || list.background;
     inputBg.dataset.bgEdit = realIndex;
     inputBg.style.width = '24px';
     inputBg.style.height = '24px';
     inputBg.style.flexShrink = '0';
 
-    const inputFg = document.createElement("input");
-    inputFg.type = "color";
+    const inputFg = document.createElement('input');
+    inputFg.type = 'color';
     inputFg.value = w.foreground || list.foreground;
     inputFg.dataset.fgEdit = realIndex;
     inputFg.style.width = '24px';
     inputFg.style.height = '24px';
     inputFg.style.flexShrink = '0';
 
-    const activeContainer = document.createElement("label");
-    activeContainer.className = "word-active";
+    const activeContainer = document.createElement('label');
+    activeContainer.className = 'word-active';
     activeContainer.style.display = 'flex';
     activeContainer.style.alignItems = 'center';
     activeContainer.style.gap = '4px';
     activeContainer.style.flexShrink = '0';
 
-    const cbActive = document.createElement("input");
-    cbActive.type = "checkbox";
+    const cbActive = document.createElement('input');
+    cbActive.type = 'checkbox';
     cbActive.checked = w.active !== false;
     cbActive.dataset.activeEdit = realIndex;
-    cbActive.className = "switch";
+    cbActive.className = 'switch';
 
     activeContainer.appendChild(cbActive);
 
@@ -239,7 +231,7 @@ function renderWords() {
 
 document.addEventListener('DOMContentLoaded', () => {
   localizePage();
-  document.getElementById("selectAllBtn").onclick = () => {
+  document.getElementById('selectAllBtn').onclick = () => {
     const list = lists[currentListIndex];
     list.words.forEach((_, index) => {
       selectedCheckboxes.add(index);
@@ -247,13 +239,13 @@ document.addEventListener('DOMContentLoaded', () => {
     renderWords();
   };
 
-  document.getElementById("globalHighlightToggle").addEventListener('change', function () {
+  document.getElementById('globalHighlightToggle').addEventListener('change', function () {
     globalHighlightEnabled = this.checked;
     updateGlobalToggleState();
   });
 
-  wordList.addEventListener("change", e => {
-    if (e.target.type === "checkbox") {
+  wordList.addEventListener('change', e => {
+    if (e.target.type === 'checkbox') {
       if (e.target.dataset.index != null) {
         if (e.target.checked) {
           selectedCheckboxes.add(+e.target.dataset.index);
@@ -286,12 +278,12 @@ document.addEventListener('DOMContentLoaded', () => {
     updateListForm();
   };
 
-  document.getElementById("newListBtn").onclick = () => {
+  document.getElementById('newListBtn').onclick = () => {
     lists.push({
       id: Date.now(),
-      name: chrome.i18n.getMessage("new_list_name"),
-      background: "#ffff00",
-      foreground: "#000000",
+      name: chrome.i18n.getMessage('new_list_name'),
+      background: '#ffff00',
+      foreground: '#000000',
       active: true,
       words: []
     });
@@ -299,8 +291,8 @@ document.addEventListener('DOMContentLoaded', () => {
     save();
   };
 
-  document.getElementById("deleteListBtn").onclick = () => {
-    if (confirm(chrome.i18n.getMessage("confirm_delete_list"))) {
+  document.getElementById('deleteListBtn').onclick = () => {
+    if (confirm(chrome.i18n.getMessage('confirm_delete_list'))) {
       lists.splice(currentListIndex, 1);
       currentListIndex = Math.max(0, currentListIndex - 1);
       save();
@@ -312,16 +304,16 @@ document.addEventListener('DOMContentLoaded', () => {
   listFg.oninput = () => { lists[currentListIndex].foreground = listFg.value; save(); };
   listActive.onchange = () => { lists[currentListIndex].active = listActive.checked; save(); };
 
-  document.getElementById("addWordsBtn").onclick = () => {
+  document.getElementById('addWordsBtn').onclick = () => {
     const words = bulkPaste.value.split(/\n+/).map(w => w.trim()).filter(Boolean);
     const list = lists[currentListIndex];
-    for (const w of words) list.words.push({ wordStr: w, background: "", foreground: "", active: true });
-    bulkPaste.value = "";
+    for (const w of words) list.words.push({ wordStr: w, background: '', foreground: '', active: true });
+    bulkPaste.value = '';
     save();
   };
 
-  document.getElementById("deleteSelectedBtn").onclick = () => {
-    if (confirm(chrome.i18n.getMessage("confirm_delete_words"))) {
+  document.getElementById('deleteSelectedBtn').onclick = () => {
+    if (confirm(chrome.i18n.getMessage('confirm_delete_words'))) {
       const list = lists[currentListIndex];
       const toDelete = Array.from(selectedCheckboxes);
       lists[currentListIndex].words = list.words.filter((_, i) => !toDelete.includes(i));
@@ -331,7 +323,7 @@ document.addEventListener('DOMContentLoaded', () => {
     }
   };
 
-  document.getElementById("disableSelectedBtn").onclick = () => {
+  document.getElementById('disableSelectedBtn').onclick = () => {
     const list = lists[currentListIndex];
     selectedCheckboxes.forEach(index => {
       list.words[index].active = false;
@@ -340,7 +332,7 @@ document.addEventListener('DOMContentLoaded', () => {
     renderWords();
   };
 
-  document.getElementById("enableSelectedBtn").onclick = () => {
+  document.getElementById('enableSelectedBtn').onclick = () => {
     const list = lists[currentListIndex];
     selectedCheckboxes.forEach(index => {
       list.words[index].active = true;
@@ -349,7 +341,7 @@ document.addEventListener('DOMContentLoaded', () => {
     renderWords();
   };
 
-  wordList.addEventListener("input", e => {
+  wordList.addEventListener('input', e => {
     const index = e.target.dataset.wordEdit ?? e.target.dataset.bgEdit ?? e.target.dataset.fgEdit;
     if (index == null) return;
 
@@ -361,18 +353,18 @@ document.addEventListener('DOMContentLoaded', () => {
     save();
   });
 
-  const exportBtn = document.getElementById("exportBtn");
+  const exportBtn = document.getElementById('exportBtn');
   exportBtn.onclick = () => {
-    const blob = new Blob([JSON.stringify(lists, null, 2)], { type: "application/json" });
+    const blob = new Blob([JSON.stringify(lists, null, 2)], { type: 'application/json' });
     const url = URL.createObjectURL(blob);
-    const a = document.createElement("a");
+    const a = document.createElement('a');
     a.href = url;
-    a.download = "highlight-lists.json";
+    a.download = 'highlight-lists.json';
     a.click();
     URL.revokeObjectURL(url);
   };
 
-  const importBtn = document.getElementById("importBtn");
+  const importBtn = document.getElementById('importBtn');
   importBtn.onclick = () => importInput.click();
 
   importInput.onchange = e => {
@@ -388,7 +380,7 @@ document.addEventListener('DOMContentLoaded', () => {
           save();
         }
       } catch (err) {
-        alert(chrome.i18n.getMessage("invalid_json_error"));
+        alert(chrome.i18n.getMessage('invalid_json_error:' + err.message));
       }
     };
     reader.readAsText(file);
@@ -435,13 +427,13 @@ document.addEventListener('DOMContentLoaded', () => {
     }
   });
 
-  document.getElementById("deselectAllBtn").onclick = () => {
+  document.getElementById('deselectAllBtn').onclick = () => {
     selectedCheckboxes.clear();
     renderWords();
   };
 
-  const wordSearch = document.getElementById("wordSearch");
-  wordSearch.addEventListener("input", (e) => {
+  const wordSearch = document.getElementById('wordSearch');
+  wordSearch.addEventListener('input', (e) => {
     wordSearchQuery = e.target.value;
     renderWords();
   });
diff --git a/storage.js b/storage.js
deleted file mode 100644
index add51e3..0000000
--- a/storage.js
+++ /dev/null
@@ -1,8 +0,0 @@
-async function getLists() {
-    const { lists } = await chrome.storage.local.get("lists");
-    return lists || [];
-}
-
-async function saveLists(lists) {
-    await chrome.storage.local.set({ lists });
-}