Examine source code of Proxy Switch

{
  "manifest_version": 2,
  "name": "Proxy Switch",
  "version": "2.0.0",
  "author": "Pieterv24",
  "homepage_url": "https://github.com/Pieterv24/proxy-toggle",
  "description": "Easily toggle between proxy settings.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{7728859b-b65a-45f4-ba27-9496c4c7e3c1}",
      "strict_min_version": "91.1.0"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "proxy"
  ],
  "browser_action": {
    "default_icon": {
      "32": "icons/icon-32.png",
      "64": "icons/icon-64.png"
    },
    "default_title": "Turn on proxy",
    "default_popup": "popup.html"
  }
}