Examine source code of TransferNow

{
  "manifest_version": 2,
  "name": "__MSG_extension_name__",
  "version": "1.0.0",
  "description": "__MSG_extension_description_firefox__",
  "default_locale": "en",
  "author": "TransferNow",
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox@transfernow.net",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "personallyIdentifyingInfo"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "notifications",
    "https://*.transfernow.net/*"
  ],
  "browser_action": {
    "default_title": "TransferNow",
    "default_icon": {
      "16": "assets/icons/icon-16.png",
      "32": "assets/icons/icon-32.png",
      "48": "assets/icons/icon-48.png"
    }
  },
  "sidebar_action": {
    "default_title": "TransferNow",
    "default_panel": "sidebar.html",
    "default_icon": {
      "16": "assets/icons/icon-16.png",
      "32": "assets/icons/icon-32.png"
    },
    "open_at_install": false
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://connect.transfernow.net/*"
      ],
      "js": [
        "auth-bridge.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "sidebar.html",
    "sidebar.bundle.js",
    "assets/*"
  ],
  "icons": {
    "48": "assets/icons/icon-48.png",
    "96": "assets/icons/icon-96.png",
    "128": "assets/icons/icon-128.png"
  }
}