Examine source code of Proxy connector

{
  "manifest_version": 2,
  "name": "Proxy connector",
  "version": "0.2resigned1",
  "description": "Simple button to switch between a proxy and a direct connection.",
  "icons": {
    "48": "icons/network-connect.svg",
    "96": "icons/network-connect.svg"
  },
  "permissions": [
    "storage",
    "proxy"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/network-connect.svg",
    "default_title": "Proxy connector"
  },
  "background": {
    "scripts": [
      "default.js",
      "background.js"
    ]
  },
  "options_ui": {
    "page": "settings.html",
    "browser_style": false,
    "open_in_tab": true
  },
  "applications": {
    "gecko": {
      "strict_min_version": "57.0",
      "id": "{8852ada5-fb30-41fc-b2b5-079234ab7f4e}"
    }
  }
}