Examine source code of SearchSwitcher

{
  "name": "SearchSwitcher",
  "version": "0.0.4",
  "description": "Search switcher",
  "manifest_version": 2,
  "author": "Isaac Shoebottom",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_title": "Switch Search"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fe578e47-2ca3-4ea6-b47a-fb07104d5a4e}"
    }
  }
}