Examine source code of New Tab. Minimal.

{
  "applications": {
    "gecko": {
      "id": "{bb22a687-276b-4a5d-b450-85170b8307bf}"
    }
  },
  "background": {
    "scripts": [
      "js/background.js",
      "js/search_engine_bg.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "source/index.html"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "js/search_content.js"
      ],
      "matches": [
        "*://newtab.club/*"
      ],
      "run_at": "document_start"
    }
  ],
  "default_locale": "en",
  "description": "__MSG_appDesc__",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "permissions": [
    "webRequest",
    "cookies",
    "history",
    "tabs",
    "*://*.newtab.club/*",
    "storage"
  ],
  "version": "1.0.0.31"
}