Examine source code of Select Search

{
  "manifest_version": 2,
  "name": "Select Search",
  "version": "1.1",
  "description": "Adds search functionality to large select lists",
  "icons": {
    "32": "icons/select-search-32.png",
    "64": "icons/select-search-64.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "select-search.js"
      ],
      "css": [
        "select-search.css"
      ],
      "all_frames": true
    }
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "browser_action": {
    "default_icon": {
      "32": "icons/select-search-32.png",
      "64": "icons/select-search-64.png"
    },
    "default_title": "Select Search Options"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "select-search@example.com"
    }
  }
}