Examine source code of Favicon Reloader

{
  "manifest_version": 2,
  "name": "Favicon Reloader",
  "version": "1.1",
  "description": "Reloads missing favicons for bookmarks in a visible tab",
  "permissions": [
    "bookmarks",
    "tabs",
    "storage",
    "activeTab",
    "webRequest",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5b0f9343-c932-4a55-824f-45f1429184c9}"
    }
  }
}