Examine source code of WebRequest Rules

{
  "description": "Customize web requests by coding JavaScript yourself.",
  "manifest_version": 2,
  "name": "WebRequest Rules",
  "icons": {
    "32": "/icon.svg",
    "128": "/icon.svg"
  },
  "version": "4.6",
  "permissions": [
    "declarativeNetRequestWithHostAccess",
    "storage",
    "tabs",
    "unlimitedStorage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "optional_permissions": [
    "bookmarks",
    "clipboardRead",
    "clipboardWrite",
    "cookies",
    "declarativeNetRequestFeedback",
    "downloads",
    "history",
    "notifications",
    "tabGroups",
    "tabHide",
    "webNavigation",
    "webRequestFilterResponse.serviceWorkerScript"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self';",
  "background": {
    "scripts": [
      "assets/configs.js",
      "assets/util.js",
      "tab.js",
      "assets/legacy-encoding.js",
      "external/text-encoding/encoding-indexes.js",
      "external/text-encoding/encoding.js",
      "background.js"
    ]
  },
  "options_ui": {
    "page": "assets/index.html#/options",
    "browser_style": false,
    "open_in_tab": true
  },
  "browser_action": {
    "default_popup": "assets/index.html#/popup",
    "browser_style": false,
    "default_icon": "/icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "webrequest@example.com"
    }
  },
  "commands": {
    "_execute_browser_action": {},
    "toggle-tab-status": {
      "description": "Toggle current tab status"
    },
    "toggle-global-status": {
      "description": "Toggle global status"
    },
    "open-options": {
      "description": "Open options page"
    }
  }
}