diff --git a/.eslintignore b/.eslintignore
deleted file mode 100644
index a1279de754437..0000000000000
--- a/.eslintignore
+++ /dev/null
@@ -1,13 +0,0 @@
-build/
-l10n/
-docs/
-node_modules/
-external/bcmaps/
-external/builder/fixtures/
-external/builder/fixtures_babel/
-external/quickjs/
-external/openjpeg/
-test/tmp/
-test/pdfs/
-web/locale/
-*~/
diff --git a/.eslintrc b/.eslintrc
deleted file mode 100644
index 87715ac69acd0..0000000000000
--- a/.eslintrc
+++ /dev/null
@@ -1,265 +0,0 @@
-{
-  "parserOptions": {
-    "ecmaVersion": 2022,
-    "sourceType": "module",
-  },
-
-  "plugins": [
-    "import",
-    "json",
-    "no-unsanitized",
-    "perfectionist",
-    "unicorn",
-  ],
-
-  "extends": [
-    "plugin:json/recommended",
-    "plugin:prettier/recommended"
-  ],
-
-  "env": {
-    "browser": true,
-    "es2022": true,
-    "worker": true,
-  },
-
-  "globals": {
-    "PDFJSDev": "readonly",
-    "__non_webpack_import__": "readonly",
-  },
-
-  "rules": {
-    // Plugins
-    "import/export": "error",
-    "import/exports-last": "error",
-    "import/extensions": ["error", "always", { "ignorePackages": true, }],
-    "import/first": "error",
-    "import/named": "error",
-    "import/no-cycle": "error",
-    "import/no-empty-named-blocks": "error",
-    "import/no-commonjs": "error",
-    "import/no-mutable-exports": "error",
-    "import/no-self-import": "error",
-    "import/no-unresolved": ["error", {
-      "ignore": ["display", "pdfjs", "pdfjs-lib", "pdfjs-web", "web", "fluent-bundle", "fluent-dom"],
-    }],
-    "no-unsanitized/method": "error",
-    "no-unsanitized/property": "error",
-    "perfectionist/sort-exports": "error",
-    "perfectionist/sort-named-exports": "error",
-    "unicorn/no-abusive-eslint-disable": "error",
-    "unicorn/no-array-push-push": "error",
-    "unicorn/no-instanceof-array": "error",
-    "unicorn/no-invalid-remove-event-listener": "error",
-    "unicorn/no-new-buffer": "error",
-    "unicorn/no-typeof-undefined": ["error", {
-      "checkGlobalVariables": false,
-    }],
-    "unicorn/no-useless-promise-resolve-reject": "error",
-    "unicorn/no-useless-spread": "error",
-    "unicorn/prefer-array-find": "error",
-    "unicorn/prefer-array-flat": "error",
-    "unicorn/prefer-array-flat-map": "error",
-    "unicorn/prefer-array-index-of": "error",
-    "unicorn/prefer-array-some": "error",
-    "unicorn/prefer-at": "error",
-    "unicorn/prefer-date-now": "error",
-    "unicorn/prefer-dom-node-append": "error",
-    "unicorn/prefer-dom-node-remove": "error",
-    "unicorn/prefer-includes": "error",
-    "unicorn/prefer-logical-operator-over-ternary": "error",
-    "unicorn/prefer-modern-dom-apis": "error",
-    "unicorn/prefer-modern-math-apis": "error",
-    "unicorn/prefer-negative-index": "error",
-    "unicorn/prefer-optional-catch-binding": "error",
-    "unicorn/prefer-regexp-test": "error",
-    "unicorn/prefer-string-replace-all": "error",
-    "unicorn/prefer-string-starts-ends-with": "error",
-    "unicorn/prefer-ternary": ["error", "only-single-line"],
-    "unicorn/throw-new-error": "error",
-
-    // Possible errors
-    "for-direction": "error",
-    "getter-return": "error",
-    "no-async-promise-executor": "error",
-    "no-cond-assign": ["error", "except-parens"],
-    "no-constant-condition": ["error", { "checkLoops": false, }],
-    "no-debugger": "error",
-    "no-dupe-args": "error",
-    "no-dupe-else-if": "error",
-    "no-dupe-keys": "error",
-    "no-duplicate-case": "error",
-    "no-empty": ["error", { "allowEmptyCatch": true, }],
-    "no-empty-character-class": "error",
-    "no-ex-assign": "error",
-    "no-extra-boolean-cast": "error",
-    "no-func-assign": "error",
-    "no-inner-declarations": ["error", "functions"],
-    "no-invalid-regexp": "error",
-    "no-irregular-whitespace": "error",
-    "no-loss-of-precision": "error",
-    "no-obj-calls": "error",
-    "no-promise-executor-return": "error",
-    "no-regex-spaces": "error",
-    "no-setter-return": "error",
-    "no-sparse-arrays": "error",
-    "no-template-curly-in-string": "error",
-    "no-unexpected-multiline": "error",
-    "no-unreachable": "error",
-    "no-unsafe-finally": "error",
-    "no-unsafe-negation": "error",
-    "no-unsafe-optional-chaining": ["error", { "disallowArithmeticOperators": true }],
-    "no-unused-private-class-members": "error",
-    "use-isnan": ["error", { "enforceForIndexOf": true, }],
-    "valid-typeof": ["error", { "requireStringLiterals": true, }],
-
-    // Best Practices
-    "accessor-pairs": ["error", {
-      "setWithoutGet": true,
-      "enforceForClassMembers": true,
-    }],
-    "consistent-return": "error",
-    "curly": ["error", "all"],
-    "default-case-last": "error",
-    "dot-notation": "error",
-    "eqeqeq": ["error", "always"],
-    "grouped-accessor-pairs": ["error", "getBeforeSet"],
-    "no-alert": "error",
-    "no-caller": "error",
-    "no-else-return": "error",
-    "no-empty-pattern": "error",
-    "no-eval": "error",
-    "no-extend-native": "error",
-    "no-extra-bind": "error",
-    "no-extra-label": "error",
-    "no-fallthrough": "error",
-    "no-floating-decimal": "error",
-    "no-global-assign": "error",
-    "no-implied-eval": "error",
-    "no-iterator": "error",
-    "no-lone-blocks": "error",
-    "no-lonely-if": "error",
-    "no-multi-str": "error",
-    "no-new": "error",
-    "no-new-func": "error",
-    "no-new-symbol": "error",
-    "no-new-wrappers": "error",
-    "no-octal-escape": "error",
-    "no-octal": "error",
-    "no-redeclare": "error",
-    "no-return-await": "error",
-    "no-self-assign": "error",
-    "no-self-compare": "error",
-    "no-throw-literal": "error",
-    "no-unused-expressions": "error",
-    "no-unused-labels": "error",
-    "no-useless-call": "error",
-    "no-useless-catch": "error",
-    "no-useless-concat": "error",
-    "no-useless-escape": "error",
-    "no-useless-return": "error",
-    "prefer-promise-reject-errors": "error",
-    "prefer-spread": "error",
-    "wrap-iife": ["error", "any"],
-    "yoda": ["error", "never", {
-      "exceptRange": true,
-    }],
-
-    // Strict Mode
-    "strict": ["off", "global"],
-
-    // Variables
-    "no-delete-var": "error",
-    "no-label-var": "error",
-    "no-shadow": "error",
-    "no-shadow-restricted-names": "error",
-    "no-undef-init": "error",
-    "no-undef": ["error", { "typeof": true, }],
-    "no-unused-vars": ["error", {
-      "vars": "all",
-      "args": "none",
-    }],
-    "no-use-before-define": ["error", {
-      "functions": false,
-      "classes": false,
-      "variables": false,
-    }],
-
-    // Stylistic Issues
-    "lines-between-class-members": ["error", "always"],
-    "max-len": ["error", {
-      "code": 1000,
-      "comments": 80,
-      "ignoreUrls": true
-    }],
-    "new-cap": ["error", { "newIsCap": true, "capIsNew": false, }],
-    "no-array-constructor": "error",
-    "no-multiple-empty-lines": ["error", { "max": 1, "maxEOF": 0, "maxBOF": 1, }],
-    "no-nested-ternary": "error",
-    "no-new-object": "error",
-    "no-restricted-syntax": ["error",
-      {
-        "selector": "BinaryExpression[operator='instanceof'][right.name='Object']",
-        "message": "Use `typeof` rather than `instanceof Object`.",
-      },
-      {
-        "selector": "CallExpression[callee.name='assert'][arguments.length!=2]",
-        "message": "`assert()` must always be invoked with two arguments.",
-      },
-      {
-        "selector": "CallExpression[callee.name='isCmd'][arguments.length<2]",
-        "message": "Use `instanceof Cmd` rather than `isCmd()` with one argument.",
-      },
-      {
-        "selector": "CallExpression[callee.name='isDict'][arguments.length<2]",
-        "message": "Use `instanceof Dict` rather than `isDict()` with one argument.",
-      },
-      {
-        "selector": "CallExpression[callee.name='isName'][arguments.length<2]",
-        "message": "Use `instanceof Name` rather than `isName()` with one argument.",
-      },
-      {
-        "selector": "NewExpression[callee.name='Cmd']",
-        "message": "Use `Cmd.get()` rather than `new Cmd()`.",
-      },
-      {
-        "selector": "NewExpression[callee.name='Name']",
-        "message": "Use `Name.get()` rather than `new Name()`.",
-      },
-      {
-        "selector": "NewExpression[callee.name='Ref']",
-        "message": "Use `Ref.get()` rather than `new Ref()`.",
-      },
-    ],
-    "no-unneeded-ternary": "error",
-    "operator-assignment": "error",
-    "prefer-exponentiation-operator": "error",
-    "spaced-comment": ["error", "always", {
-      "block": {
-        "balanced": true,
-      }
-    }],
-
-    // ECMAScript 6
-    "arrow-body-style": ["error", "as-needed"],
-    "constructor-super": "error",
-    "no-class-assign": "error",
-    "no-const-assign": "error",
-    "no-dupe-class-members": "error",
-    "no-duplicate-imports": "error",
-    "no-this-before-super": "error",
-    "no-useless-computed-key": "error",
-    "no-useless-constructor": "error",
-    "no-useless-rename": "error",
-    "no-var": "error",
-    "object-shorthand": ["error", "always", {
-      "avoidQuotes": true,
-    }],
-    "prefer-const": "error",
-    "require-yield": "error",
-    "sort-imports": ["error", {
-      "ignoreCase": true,
-    }],
-    "template-curly-spacing": ["error", "never"],
-  },
-}
diff --git a/eslint.config.mjs b/eslint.config.mjs
new file mode 100644
index 0000000000000..e0c2b8b014e31
--- /dev/null
+++ b/eslint.config.mjs
@@ -0,0 +1,436 @@
+import globals from "globals";
+
+import import_ from "eslint-plugin-import";
+import jasmine from "eslint-plugin-jasmine";
+import json from "eslint-plugin-json";
+import noUnsanitized from "eslint-plugin-no-unsanitized";
+import perfectionist from "eslint-plugin-perfectionist";
+import prettierRecommended from "eslint-plugin-prettier/recommended";
+import unicorn from "eslint-plugin-unicorn";
+
+const jsFiles = folder => {
+  const prefix = folder === "." ? "" : folder + "/";
+  return [prefix + "**/*.js", prefix + "**/*.jsm", prefix + "**/*.mjs"];
+};
+
+// Include all files referenced in extensions/chromium/background.js
+const chromiumExtensionServiceWorkerFiles = [
+  "extensions/chromium/extension-router.js",
+  "extensions/chromium/options/migration.js",
+  "extensions/chromium/pdfHandler.js",
+  "extensions/chromium/preserve-referer.js",
+  "extensions/chromium/suppress-update.js",
+  "extensions/chromium/telemetry.js",
+];
+
+export default [
+  {
+    ignores: [
+      "**/build/",
+      "**/l10n/",
+      "**/docs/",
+      "**/node_modules/",
+      "external/bcmaps/",
+      "external/builder/fixtures/",
+      "external/builder/fixtures_babel/",
+      "external/quickjs/",
+      "external/openjpeg/",
+      "test/tmp/",
+      "test/pdfs/",
+      "web/locale/",
+      "**/*~/",
+    ],
+  },
+
+  /* ======================================================================== *\
+                             Base configuration
+  \* ======================================================================== */
+
+  prettierRecommended,
+  {
+    files: ["**/*.json"],
+    ...json.configs.recommended,
+  },
+  {
+    files: jsFiles("."),
+    ignores: chromiumExtensionServiceWorkerFiles,
+    languageOptions: {
+      globals: globals.browser,
+    },
+  },
+  {
+    files: jsFiles("."),
+
+    plugins: {
+      import: import_.flatConfigs.recommended.plugins.import,
+      json,
+      "no-unsanitized": noUnsanitized,
+      perfectionist,
+      unicorn,
+    },
+
+    languageOptions: {
+      globals: {
+        ...globals.worker,
+        PDFJSDev: "readonly",
+        __non_webpack_import__: "readonly",
+      },
+
+      ecmaVersion: 2022,
+      sourceType: "module",
+    },
+
+    rules: {
+      "import/export": "error",
+      "import/exports-last": "error",
+      "import/extensions": ["error", "always", { ignorePackages: true }],
+      "import/first": "error",
+      "import/named": "error",
+      "import/no-cycle": "error",
+      "import/no-empty-named-blocks": "error",
+      "import/no-commonjs": "error",
+      "import/no-mutable-exports": "error",
+      "import/no-self-import": "error",
+      "import/no-unresolved": [
+        "error",
+        {
+          ignore: [
+            "display",
+            "pdfjs",
+            "pdfjs-lib",
+            "pdfjs-web",
+            "web",
+            "fluent-bundle",
+            "fluent-dom",
+          ],
+        },
+      ],
+      "no-unsanitized/method": "error",
+      "no-unsanitized/property": "error",
+      "perfectionist/sort-exports": "error",
+      "perfectionist/sort-named-exports": "error",
+      "unicorn/no-abusive-eslint-disable": "error",
+      "unicorn/no-array-push-push": "error",
+      "unicorn/no-instanceof-array": "error",
+      "unicorn/no-invalid-remove-event-listener": "error",
+      "unicorn/no-new-buffer": "error",
+      "unicorn/no-typeof-undefined": ["error", { checkGlobalVariables: false }],
+      "unicorn/no-useless-promise-resolve-reject": "error",
+      "unicorn/no-useless-spread": "error",
+      "unicorn/prefer-array-find": "error",
+      "unicorn/prefer-array-flat": "error",
+      "unicorn/prefer-array-flat-map": "error",
+      "unicorn/prefer-array-index-of": "error",
+      "unicorn/prefer-array-some": "error",
+      "unicorn/prefer-at": "error",
+      "unicorn/prefer-date-now": "error",
+      "unicorn/prefer-dom-node-append": "error",
+      "unicorn/prefer-dom-node-remove": "error",
+      "unicorn/prefer-includes": "error",
+      "unicorn/prefer-logical-operator-over-ternary": "error",
+      "unicorn/prefer-modern-dom-apis": "error",
+      "unicorn/prefer-modern-math-apis": "error",
+      "unicorn/prefer-negative-index": "error",
+      "unicorn/prefer-optional-catch-binding": "error",
+      "unicorn/prefer-regexp-test": "error",
+      "unicorn/prefer-string-replace-all": "error",
+      "unicorn/prefer-string-starts-ends-with": "error",
+      "unicorn/prefer-ternary": ["error", "only-single-line"],
+      "unicorn/throw-new-error": "error",
+
+      // Possible errors
+      "for-direction": "error",
+      "getter-return": "error",
+      "no-async-promise-executor": "error",
+      "no-cond-assign": ["error", "except-parens"],
+      "no-constant-condition": ["error", { checkLoops: false }],
+      "no-debugger": "error",
+      "no-dupe-args": "error",
+      "no-dupe-else-if": "error",
+      "no-dupe-keys": "error",
+      "no-duplicate-case": "error",
+      "no-empty": ["error", { allowEmptyCatch: true }],
+      "no-empty-character-class": "error",
+      "no-ex-assign": "error",
+      "no-extra-boolean-cast": "error",
+      "no-func-assign": "error",
+      "no-inner-declarations": ["error", "functions"],
+      "no-invalid-regexp": "error",
+      "no-irregular-whitespace": "error",
+      "no-loss-of-precision": "error",
+      "no-obj-calls": "error",
+      "no-promise-executor-return": "error",
+      "no-regex-spaces": "error",
+      "no-setter-return": "error",
+      "no-sparse-arrays": "error",
+      "no-template-curly-in-string": "error",
+      "no-unexpected-multiline": "error",
+      "no-unreachable": "error",
+      "no-unsafe-finally": "error",
+      "no-unsafe-negation": "error",
+      "no-unsafe-optional-chaining": [
+        "error",
+        { disallowArithmeticOperators: true },
+      ],
+      "no-unused-private-class-members": "error",
+      "use-isnan": ["error", { enforceForIndexOf: true }],
+      "valid-typeof": ["error", { requireStringLiterals: true }],
+
+      // Best Practices
+      "accessor-pairs": [
+        "error",
+        { setWithoutGet: true, enforceForClassMembers: true },
+      ],
+      "consistent-return": "error",
+      curly: ["error", "all"],
+      "default-case-last": "error",
+      "dot-notation": "error",
+      eqeqeq: ["error", "always"],
+      "grouped-accessor-pairs": ["error", "getBeforeSet"],
+      "no-alert": "error",
+      "no-caller": "error",
+      "no-else-return": "error",
+      "no-empty-pattern": "error",
+      "no-eval": "error",
+      "no-extend-native": "error",
+      "no-extra-bind": "error",
+      "no-extra-label": "error",
+      "no-fallthrough": "error",
+      "no-floating-decimal": "error",
+      "no-global-assign": "error",
+      "no-implied-eval": "error",
+      "no-iterator": "error",
+      "no-lone-blocks": "error",
+      "no-lonely-if": "error",
+      "no-multi-str": "error",
+      "no-new": "error",
+      "no-new-func": "error",
+      "no-new-symbol": "error",
+      "no-new-wrappers": "error",
+      "no-octal-escape": "error",
+      "no-octal": "error",
+      "no-redeclare": "error",
+      "no-return-await": "error",
+      "no-self-assign": "error",
+      "no-self-compare": "error",
+      "no-throw-literal": "error",
+      "no-unused-expressions": "error",
+      "no-unused-labels": "error",
+      "no-useless-call": "error",
+      "no-useless-catch": "error",
+      "no-useless-concat": "error",
+      "no-useless-escape": "error",
+      "no-useless-return": "error",
+      "prefer-promise-reject-errors": "error",
+      "prefer-spread": "error",
+      "wrap-iife": ["error", "any"],
+      yoda: ["error", "never", { exceptRange: true }],
+
+      // Strict Mode
+      strict: ["off", "global"],
+
+      // Variables
+      "no-delete-var": "error",
+      "no-label-var": "error",
+      "no-shadow": "error",
+      "no-shadow-restricted-names": "error",
+      "no-undef-init": "error",
+      "no-undef": ["error", { typeof: true }],
+      "no-unused-vars": ["error", { vars: "all", args: "none" }],
+      "no-use-before-define": [
+        "error",
+        { functions: false, classes: false, variables: false },
+      ],
+
+      // Stylistic Issues
+      "lines-between-class-members": ["error", "always"],
+      "max-len": ["error", { code: 1000, comments: 80, ignoreUrls: true }],
+      "new-cap": ["error", { newIsCap: true, capIsNew: false }],
+      "no-array-constructor": "error",
+      "no-multiple-empty-lines": ["error", { max: 1, maxEOF: 0, maxBOF: 1 }],
+      "no-nested-ternary": "error",
+      "no-new-object": "error",
+      "no-restricted-syntax": [
+        "error",
+        {
+          selector:
+            "BinaryExpression[operator='instanceof'][right.name='Object']",
+          message: "Use `typeof` rather than `instanceof Object`.",
+        },
+        {
+          selector: "CallExpression[callee.name='assert'][arguments.length!=2]",
+          message: "`assert()` must always be invoked with two arguments.",
+        },
+        {
+          selector: "CallExpression[callee.name='isCmd'][arguments.length<2]",
+          message:
+            "Use `instanceof Cmd` rather than `isCmd()` with one argument.",
+        },
+        {
+          selector: "CallExpression[callee.name='isDict'][arguments.length<2]",
+          message:
+            "Use `instanceof Dict` rather than `isDict()` with one argument.",
+        },
+        {
+          selector: "CallExpression[callee.name='isName'][arguments.length<2]",
+          message:
+            "Use `instanceof Name` rather than `isName()` with one argument.",
+        },
+        {
+          selector: "NewExpression[callee.name='Cmd']",
+          message: "Use `Cmd.get()` rather than `new Cmd()`.",
+        },
+        {
+          selector: "NewExpression[callee.name='Name']",
+          message: "Use `Name.get()` rather than `new Name()`.",
+        },
+        {
+          selector: "NewExpression[callee.name='Ref']",
+          message: "Use `Ref.get()` rather than `new Ref()`.",
+        },
+      ],
+      "no-unneeded-ternary": "error",
+      "operator-assignment": "error",
+      "prefer-exponentiation-operator": "error",
+      "spaced-comment": ["error", "always", { block: { balanced: true } }],
+
+      // ECMAScript 6
+      "arrow-body-style": ["error", "as-needed"],
+      "constructor-super": "error",
+      "no-class-assign": "error",
+      "no-const-assign": "error",
+      "no-dupe-class-members": "error",
+      "no-duplicate-imports": "error",
+      "no-this-before-super": "error",
+      "no-useless-computed-key": "error",
+      "no-useless-constructor": "error",
+      "no-useless-rename": "error",
+      "no-var": "error",
+      "object-shorthand": ["error", "always", { avoidQuotes: true }],
+      "prefer-const": "error",
+      "require-yield": "error",
+      "sort-imports": ["error", { ignoreCase: true }],
+      "template-curly-spacing": ["error", "never"],
+    },
+  },
+
+  /* ======================================================================== *\
+                            Test-specific rules
+  \* ======================================================================== */
+
+  {
+    files: jsFiles("test"),
+
+    plugins: { jasmine },
+
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.jasmine,
+      },
+    },
+    rules: {
+      ...jasmine.configs.recommended.rules,
+      "jasmine/new-line-before-expect": "off",
+      "jasmine/new-line-between-declarations": "off",
+      "jasmine/no-focused-tests": "error",
+      "jasmine/no-pending-tests": "off",
+      "jasmine/no-spec-dupes": ["error", "branch"],
+      "jasmine/no-suite-dupes": ["error", "branch"],
+      "jasmine/prefer-jasmine-matcher": "off",
+      "jasmine/prefer-toHaveBeenCalledWith": "off",
+    },
+  },
+  {
+    files: jsFiles("test/fuzz"),
+    rules: {
+      "import/no-unresolved": [
+        "error",
+        { ignore: [".*/build/image_decoders/.*"] },
+      ],
+    },
+  },
+  {
+    files: jsFiles("test/unit"),
+    rules: {
+      "import/no-unresolved": ["error", { ignore: ["pdfjs/"] }],
+    },
+  },
+  {
+    files: jsFiles("test/integration"),
+    rules: {
+      "no-restricted-syntax": [
+        "error",
+        {
+          selector: "CallExpression[callee.name='waitForTimeout']",
+          message:
+            "`waitForTimeout` can cause intermittent failures and should not be used (see issue #17656 for replacements).",
+        },
+      ],
+    },
+  },
+
+  /* ======================================================================== *\
+                            External libraries
+  \* ======================================================================== */
+
+  {
+    files: jsFiles("external"),
+
+    languageOptions: { globals: globals.node },
+  },
+
+  /* ======================================================================== *\
+                             Examples
+  \* ======================================================================== */
+
+  {
+    files: jsFiles("examples"),
+
+    languageOptions: {
+      globals: {
+        pdfjsImageDecoders: false,
+        pdfjsLib: false,
+        pdfjsViewer: false,
+      },
+    },
+  },
+  {
+    files: [...jsFiles("examples/node"), ...jsFiles("examples/webpack")],
+
+    languageOptions: { globals: globals.node },
+  },
+
+  /* ======================================================================== *\
+                            Chromium extension
+  \* ======================================================================== */
+
+  {
+    files: jsFiles("extensions/chromium"),
+
+    languageOptions: {
+      globals: globals.webextensions,
+      sourceType: "script",
+    },
+
+    rules: {
+      "no-var": "off",
+    },
+  },
+  {
+    files: chromiumExtensionServiceWorkerFiles,
+
+    languageOptions: {
+      globals: globals.serviceworker,
+      sourceType: "script",
+    },
+  },
+
+  /* ======================================================================== *\
+                                Other
+  \* ======================================================================== */
+  {
+    files: ["gulpfile.mjs"],
+    languageOptions: { globals: globals.node },
+  },
+];
diff --git a/examples/.eslintrc b/examples/.eslintrc
deleted file mode 100644
index 433abdbfab2c4..0000000000000
--- a/examples/.eslintrc
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "extends": [
-    "../.eslintrc"
-  ],
-
-  "globals": {
-    "pdfjsImageDecoders": false,
-    "pdfjsLib": false,
-    "pdfjsViewer": false,
-  },
-}
diff --git a/examples/node/.eslintrc b/examples/node/.eslintrc
deleted file mode 100644
index 46f120c21a4f5..0000000000000
--- a/examples/node/.eslintrc
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-  "extends": [
-    "../.eslintrc"
-  ],
-
-  "env": {
-    "node": true,
-  },
-}
diff --git a/examples/webpack/.eslintrc b/examples/webpack/.eslintrc
deleted file mode 100644
index 46f120c21a4f5..0000000000000
--- a/examples/webpack/.eslintrc
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-  "extends": [
-    "../.eslintrc"
-  ],
-
-  "env": {
-    "node": true,
-  },
-}
diff --git a/external/.eslintrc b/external/.eslintrc
deleted file mode 100644
index e3523dce526ed..0000000000000
--- a/external/.eslintrc
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-  "extends": [
-    ../.eslintrc
-  ],
-
-  "env": {
-    "node": true,
-  },
-}
diff --git a/gulpfile.mjs b/gulpfile.mjs
index ff4802cc1f785..7c0460d0f5c78 100644
--- a/gulpfile.mjs
+++ b/gulpfile.mjs
@@ -12,7 +12,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* eslint-env node */
 
 import {
   babelPluginPDFJSPreprocessor,
@@ -1956,8 +1955,6 @@ gulp.task("lint", function (done) {
   // Ensure that we lint the Firefox specific *.jsm files too.
   const esLintOptions = [
     "node_modules/eslint/bin/eslint",
-    "--ext",
-    ".js,.jsm,.mjs,.json",
     ".",
     "--report-unused-disable-directives",
   ];
diff --git a/package-lock.json b/package-lock.json
index dc1270cb909f1..c059aba741a2e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,11 +24,12 @@
         "eslint": "^8.57.1",
         "eslint-plugin-import": "^2.31.0",
         "eslint-plugin-jasmine": "^4.2.2",
-        "eslint-plugin-json": "^3.1.0",
+        "eslint-plugin-json": "^4.0.1",
         "eslint-plugin-no-unsanitized": "^4.1.2",
         "eslint-plugin-perfectionist": "^3.9.1",
         "eslint-plugin-prettier": "^5.2.1",
         "eslint-plugin-unicorn": "^56.0.0",
+        "globals": "^15.12.0",
         "gulp": "^5.0.0",
         "gulp-cli": "^3.0.0",
         "gulp-postcss": "^10.0.0",
@@ -5454,16 +5455,17 @@
       }
     },
     "node_modules/eslint-plugin-json": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-json/-/eslint-plugin-json-3.1.0.tgz",
-      "integrity": "sha512-MrlG2ynFEHe7wDGwbUuFPsaT2b1uhuEFhJ+W1f1u+1C2EkXmTYJp4B1aAdQQ8M+CC3t//N/oRKiIVw14L2HR1g==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-json/-/eslint-plugin-json-4.0.1.tgz",
+      "integrity": "sha512-3An5ISV5dq/kHfXdNyY5TUe2ONC3yXFSkLX2gu+W8xAhKhfvrRvkSAeKXCxZqZ0KJLX15ojBuLPyj+UikQMkOA==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "lodash": "^4.17.21",
         "vscode-json-languageservice": "^4.1.6"
       },
       "engines": {
-        "node": ">=12.0"
+        "node": ">=18.0"
       }
     },
     "node_modules/eslint-plugin-no-unsanitized": {
@@ -6967,9 +6969,9 @@
       }
     },
     "node_modules/globals": {
-      "version": "15.10.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-15.10.0.tgz",
-      "integrity": "sha512-tqFIbz83w4Y5TCbtgjZjApohbuh7K9BxGYFm7ifwDR240tvdb7P9x+/9VvUKlmkPoiknoJtanI8UOrqxS3a7lQ==",
+      "version": "15.12.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-15.12.0.tgz",
+      "integrity": "sha512-1+gLErljJFhbOVyaetcwJiJ4+eLe45S2E7P5UiZ9xGfeq3ATQf5DOv9G7MH3gGbKQLkzmNh2DxfZwLdw+j6oTQ==",
       "dev": true,
       "license": "MIT",
       "engines": {
diff --git a/package.json b/package.json
index de2ae98c7ac9e..4a1a069af5e4f 100644
--- a/package.json
+++ b/package.json
@@ -19,11 +19,12 @@
     "eslint": "^8.57.1",
     "eslint-plugin-import": "^2.31.0",
     "eslint-plugin-jasmine": "^4.2.2",
-    "eslint-plugin-json": "^3.1.0",
+    "eslint-plugin-json": "^4.0.1",
     "eslint-plugin-no-unsanitized": "^4.1.2",
     "eslint-plugin-perfectionist": "^3.9.1",
     "eslint-plugin-prettier": "^5.2.1",
     "eslint-plugin-unicorn": "^56.0.0",
+    "globals": "^15.12.0",
     "gulp": "^5.0.0",
     "gulp-cli": "^3.0.0",
     "gulp-postcss": "^10.0.0",
diff --git a/src/core/image_resizer.js b/src/core/image_resizer.js
index 8652a828b60b2..a21e175ebe6f3 100644
--- a/src/core/image_resizer.js
+++ b/src/core/image_resizer.js
@@ -48,11 +48,9 @@ class ImageResizer {
     return shadow(
       this,
       "canUseImageDecoder",
-      // eslint-disable-next-line no-undef
       this.#isChrome || typeof ImageDecoder === "undefined"
         ? Promise.resolve(false)
-        : // eslint-disable-next-line no-undef
-          ImageDecoder.isTypeSupported("image/bmp")
+        : ImageDecoder.isTypeSupported("image/bmp")
     );
   }
 
@@ -185,7 +183,6 @@ class ImageResizer {
     let decoder, imagePromise;
 
     if (await ImageResizer.canUseImageDecoder) {
-      // eslint-disable-next-line no-undef
       decoder = new ImageDecoder({
         data,
         type: "image/bmp",
diff --git a/src/core/jpeg_stream.js b/src/core/jpeg_stream.js
index 6cf2de2cba764..f25ae4e40b2b7 100644
--- a/src/core/jpeg_stream.js
+++ b/src/core/jpeg_stream.js
@@ -36,11 +36,9 @@ class JpegStream extends DecodeStream {
     return shadow(
       this,
       "canUseImageDecoder",
-      // eslint-disable-next-line no-undef
       typeof ImageDecoder === "undefined"
         ? Promise.resolve(false)
-        : // eslint-disable-next-line no-undef
-          ImageDecoder.isTypeSupported("image/jpeg")
+        : ImageDecoder.isTypeSupported("image/jpeg")
     );
   }
 
@@ -163,7 +161,6 @@ class JpegStream extends DecodeStream {
       if (!JpegImage.canUseImageDecoder(data, jpegOptions.colorTransform)) {
         return null;
       }
-      // eslint-disable-next-line no-undef
       decoder = new ImageDecoder({
         data,
         type: "image/jpeg",
diff --git a/test/.eslintrc b/test/.eslintrc
deleted file mode 100644
index 4f371e4248581..0000000000000
--- a/test/.eslintrc
+++ /dev/null
@@ -1,18 +0,0 @@
-{
-  "plugins": ["jasmine"],
-  "extends": ["../.eslintrc", "plugin:jasmine/recommended"],
-  "env": {
-    "node": true,
-    "jasmine": true
-  },
-  "rules": {
-    "jasmine/new-line-before-expect": "off",
-    "jasmine/new-line-between-declarations": "off",
-    "jasmine/no-focused-tests": "error",
-    "jasmine/no-pending-tests": "off",
-    "jasmine/no-spec-dupes": ["error", "branch"],
-    "jasmine/no-suite-dupes": ["error", "branch"],
-    "jasmine/prefer-jasmine-matcher": "off",
-    "jasmine/prefer-toHaveBeenCalledWith": "off"
-  }
-}
diff --git a/test/fuzz/.eslintrc b/test/fuzz/.eslintrc
deleted file mode 100644
index 7d611b5c61737..0000000000000
--- a/test/fuzz/.eslintrc
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-  "extends": [
-    "../.eslintrc"
-  ],
-
-  "rules": {
-    "import/no-unresolved": ["error", { "ignore": [".*/build/image_decoders/.*"] }],
-  },
-}
diff --git a/test/integration/.eslintrc b/test/integration/.eslintrc
deleted file mode 100644
index 8aedbe37f89f8..0000000000000
--- a/test/integration/.eslintrc
+++ /dev/null
@@ -1,14 +0,0 @@
-{
-  "extends": [
-    "../.eslintrc"
-  ],
-
-  "rules": {
-    "no-restricted-syntax": ["error",
-      {
-        "selector": "CallExpression[callee.name='waitForTimeout']",
-        "message": "`waitForTimeout` can cause intermittent failures and should not be used (see issue #17656 for replacements).",
-      },
-    ],
-  },
-}
diff --git a/test/unit/.eslintrc b/test/unit/.eslintrc
deleted file mode 100644
index 69af6d92d1199..0000000000000
--- a/test/unit/.eslintrc
+++ /dev/null
@@ -1,10 +0,0 @@
-{
-  "extends": [
-    "../.eslintrc"
-  ],
-
-  "rules": {
-    // Plugins
-    "import/no-unresolved": ["error", { "ignore": ["pdfjs/"] }],
-  },
-}