Examine source code of Speed Dial 2 New tab page

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "short_name": "__MSG_appShortName__",
  "homepage_url": "https://www.speeddial2.com",
  "description": "__MSG_appDescription__",
  "default_locale": "en",
  "permissions": [
    "topSites",
    "tabs",
    "unlimitedStorage",
    "storage",
    "contextMenus",
    "alarms"
  ],
  "host_permissions": [
    "<all_urls>",
    "*://*/*"
  ],
  "optional_permissions": [
    "sessions",
    "bookmarks"
  ],
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; worker-src 'self'; img-src 'self' * data: file://*;"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "__MSG_appName__",
    "default_icon": {
      "19": "icons/19.png",
      "38": "icons/38.png"
    }
  },
  "version": "3.8.5",
  "chrome_url_overrides": {
    "newtab": "override.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "michal.simonfy@gmail.com",
      "strict_min_version": "60.0"
    }
  }
}