Examine source code of windmill

{
  "manifest_version": 2,
  "version": "3.88",
  "short_name": "Windmill",
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "browser_action": {
    "default_icon": "assets/images/windmill-normal-24.png",
    "default_title": "Windmill",
    "default_popup": "popup.html"
  },
  "default_locale": "en",
  "description": "__MSG_manifest_appDescription__",
  "icons": {
    "16": "assets/images/windmill-normal-16.png",
    "24": "assets/images/windmill-normal-24.png",
    "128": "assets/images/windmill-normal-128.png"
  },
  "name": "__MSG_manifest_appName__",
  "permissions": [
    "proxy",
    "tabs",
    "notifications",
    "webRequest",
    "webRequestBlocking",
    "management",
    "*://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "91.1.0",
      "id": "{ee9f24ec-fd93-4419-be07-e5352961709a}"
    }
  }
}