Examine source code of TabBerry

{
  "manifest_version": 3,
  "name": "__MSG_extName__",
  "short_name": "__MSG_extShortName__",
  "version": "1.1.5",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "options_page": "settings.html",
  "permissions": [
    "storage",
    "downloads",
    "tabs"
  ],
  "optional_permissions": [
    "bookmarks"
  ],
  "action": {
    "default_title": "__MSG_actionDefaultTitle__",
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "content_security_policy": {
    "extension_pages": "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'none'; img-src 'self' data: https:; style-src 'self'; font-src 'self'; connect-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tabberry@cairoli.dev",
      "strict_min_version": "126.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}