Examine source code of Site Launcher

{
  "manifest_version": 2,
  "name": "Site Launcher",
  "version": "1.1",
  "description": "Quick access to your favorite websites with keyboard shortcuts",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{c879c69e-0f87-405a-9707-1e92ad95cb9d}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Site Launcher",
    "default_icon": {
      "48": "icons/icon-48.png"
    }
  },
  "commands": {
    "open-site-launcher": {
      "suggested_key": {
        "default": "Ctrl+Space"
      },
      "description": "Open Site Launcher Panel"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "web_accessible_resources": [
    "options.html"
  ]
}