Examine source code of New Tab URL

{
  "manifest_version": 2,
  "name": "New Tab URL",
  "version": "1.0.0",
  "description": "Override the default new tab page with a custom URL. Supports optional HTTP Basic Authentication.",
  "author": "Anton Demydov",
  "homepage_url": "https://github.com/antondemidov/firefox_new_tab_url_extention",
  "browser_specific_settings": {
    "gecko": {
      "id": "new-tab-url@antondemidov.github.io",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    },
    "default_title": "New Tab URL Settings"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  }
}