Examine source code of FF URL Launcher

{
  "manifest_version": 2,
  "name": "FF URL Launcher",
  "version": "1.0",
  "description": "URL Launcher",
  "icons": {
    "48": "icons/FFLauncher.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/FFLauncher.png",
    "default_title": "URL Launcher",
    "default_popup": "popup/FFLauncher.html"
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ff-url-launcher@dblv.com"
    }
  }
}