Examine source code of set-Accept-Language-en-US

{
  "manifest_version": 2,
  "name": "set-Accept-Language-en-US",
  "description": "set-Accept-Language-en-US",
  "version": "2026.6.13.2",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "set-Accept-Language-en-US@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  }
}