Examine source code of Disable WebP Images

{
  "manifest_version": 3,
  "name": "Disable WebP Images",
  "version": "1.1",
  "description": "Disables WebP images by removing image/webp from Accept header",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png",
    "380": "icon380.png"
  },
  "permissions": [
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset_1",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "webp@fakturi.com"
    }
  }
}