Examine source code of Proxy Pac Switcher

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "version": "0.1.3",
  "permissions": [
    "<all_urls>",
    "*://*/*",
    "storage",
    "proxy"
  ],
  "icons": {
    "16": "icons/white16.png",
    "32": "icons/white32.png",
    "128": "icons/white128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "__MSG_extName__",
    "default_icon": {
      "16": "icons/white16.png",
      "32": "icons/white32.png",
      "128": "icons/white128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "91.1.0",
      "id": "{ac7e7f4e-789f-4cd8-9778-eee764aba375}"
    }
  },
  "content_security_policy": "script-src 'self' ; object-src 'self'"
}