Examine source code of The Search Tool

{
  "description": "Do you want to search something easily and quickly on some most visited websites like Google, Youtube, and Facebook with just one click? This extension will add 'Search this on ...' to context menu and you can freely choose between Google, Youtube, and Facebook to search the selected text.",
  "manifest_version": 2,
  "name": "The Search Tool",
  "version": "1.0",
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "icons": {
    "16": "icons/search-16.png",
    "32": "icons/search-32.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7064fa67-68af-4e64-9926-dfa2f47bf609}"
    }
  }
}