Examine source code of UFO Search

{
  "manifest_version": 2,
  "name": "UFO Search",
  "version": "1.2",
  "description": "UFO Search allows you to instantly search selected text or seamlessly transfer a query between search engines. You can initiate the search using links on the banner displayed at the bottom of the webpage or through a dedicated bookmark in your browser's bookmark toolbar.",
  "permissions": [
    "bookmarks",
    "storage",
    "activeTab",
    "tabs",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "scripting"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "18": "icons/icon18.png",
    "22": "icons/icon22.png",
    "24": "icons/icon24.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "18": "icons/icon18.png",
      "22": "icons/icon22.png",
      "24": "icons/icon24.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "banner.css",
    "icons/icon16.png",
    "icons/icon18.png",
    "icons/icon22.png",
    "icons/icon24.png",
    "icons/icon32.png",
    "icons/icon48.png",
    "icons/icon128.png"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+S",
        "mac": "Command+Shift+S"
      },
      "description": "Open the UFO Search manager"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ufo-search@yourdomain.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}