Examine source code of Simple MHT Viewer

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.0",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "icons": {
    "48": "icon.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "__MSG_openViewer__",
    "default_icon": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "mht-viewer@yourdomain.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab"
  ]
}