Examine source code of Coinbase

{
  "manifest_version": 2,
  "name": "Coinbase Wallet extension",
  "description": "Coinbase Wallet extension is the safest and easiest way to use crypto apps in your browser.",
  "version": "3.120.0",
  "icons": {
    "16": "favicon.ico",
    "48": "favicon.ico",
    "128": "favicon.ico"
  },
  "browser_action": {
    "default_popup": "index.html"
  },
  "applications": {
    "gecko": {
      "id": "{74daf2f5-6377-4135-95cd-59e96fb05aa8}",
      "strict_min_version": "110.0"
    }
  }
}