Examine source code of SearchMenu Add-on

{
  "manifest_version": 2,
  "name": "SearchMenu Add-on",
  "version": "1.1.3",
  "description": "Adds a contextmenu to search for selected text in user-configurable searchengines.",
  "permissions": [
    "contextMenus",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "icons": {
    "48": "icon.png"
  },
  "applications": {
    "gecko": {
      "id": "searchmenuaddon@example.com"
    }
  }
}