Examine source code of Proxy Switcher

{
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "91.1.0",
      "id": "hoangninyb@gmail.com"
    }
  },
  "background": {
    "scripts": [
      "static/js/config.js",
      "static/js/background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "__MSG_defTitle__",
    "default_icon": {
      "16": "static/images/icon16_disabled.png",
      "24": "static/images/icon24_disabled.png",
      "32": "static/images/icon32_disabled.png"
    },
    "default_popup": "popup.html"
  },
  "default_locale": "en",
  "description": "__MSG_extDescr__",
  "icons": {
    "16": "static/images/icon16_enabled.png",
    "48": "static/images/icon48_enabled.png",
    "128": "static/images/icon128_enabled.png"
  },
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "proxy",
    "tabs",
    "browsingData",
    "<all_urls>"
  ],
  "version": "1.0.0.1"
}