Examine source code of ExpressVPN Extension

{
  "manifest_version": 2,
  "name": "ExpressVPN Extension",
  "version": "1.0.0",
  "description": "ExpressVPN Extension skeleton.",
  "browser_specific_settings": {
    "gecko": {
      "id": "joettel.i.ng.2.5.88@gmail.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  }
}