Examine source code of Proxy Switcher

{
  "manifest_version": 2,
  "name": "Proxy Switcher",
  "version": "1.0",
  "description": "Quickly switch browser proxy settings.",
  "permissions": [
    "proxy",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Proxy Switcher",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ssemugg.a.s.ul.a46@gmail.com",
      "strict_min_version": "91.1.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}