Examine source code of Travel Tab

{
  "browser_specific_settings": {
    "gecko": {
      "id": "official@traveltab"
    }
  },
  "name": "Travel Tab",
  "short_name": "Travel Tab",
  "description": "Hotels and travel news on your new tab page",
  "version": "1.4",
  "icons": {
    "16": "16.png",
    "32": "32.png",
    "48": "48.png",
    "128": "128.png"
  },
  "background": {
    "scripts": [
      "js/booking.js",
      "js/worker.js"
    ]
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "Travel Search (Powered by Bing)",
      "search_url": "https://traveldailydiscounts.com/s/?addon=firefox&ver=1.4&an=tddcom&method=topbar&q={searchTerms}",
      "keyword": "www",
      "favicon_url": "https://traveldailydiscounts.com/img/favicon.ico",
      "is_default": true,
      "suggest_url": "https://ff.search.yahoo.com/gossip?output=fxjson&command={searchTerms}"
    }
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.booking.com/*",
    "*://*.traveldailydiscounts.com/*"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "manifest_version": 2
}