Examine source code of GMail Background GIF

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manifest.json
{
  "name": "GMail Background GIF",
  "version": "1.1.2",
  "description": "Makes animated GIFs as GMail background possible. Add a GIF in a Google Photos album and use it as theme in GMail settings. Give the two authorizations in the add-on permissions for it to work.",
  "manifest_version": 3,
  "icons": {
    "128": "icon.082f75ba.png"
  },
  "permissions": [
    "declarativeNetRequestWithHostAccess"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{45d40588-c9d9-4a33-a1fb-d7ae708a2471}"
    }
  },
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset",
        "enabled": true,
        "path": "rules.e561ba7b.json"
      }
    ]
  },
  "host_permissions": [
    "*://mail.google.com/*",
    "*://lh3.googleusercontent.com/*"
  ]
}