Examine source code of Proxy Toggle v2

{
  "manifest_version": 2,
  "name": "Proxy Toggle",
  "version": "1.0",
  "description": "Easily toggle your proxy settings between 'No Proxy' and 'Manual Proxy' with a click of a button. Includes fun Twitch emotes!",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{082ad7f8-9265-42ad-b360-cdb2208323cb}"
    }
  }
}