Examine source code of Tresorit for Gmail

{
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "version": "2.2.0",
  "author": "Tresorit",
  "icons": {
    "128": "icons/favicon-128.png"
  },
  "permissions": [
    "storage",
    "https://northeurope-2.in.applicationinsights.azure.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "dist/content-script.js"
      ],
      "css": [
        "assets/style.css",
        "assets/spinner.css"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "page": "dist/background/background.html"
  },
  "web_accessible_resources": [
    "assets/*.png",
    "assets/*.svg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e292a19c-7267-4cd2-9659-212407f369a1}"
    }
  }
}