[
  {
    "namespace": "manifest",
    "types": [
      {
        "$extend": "WebExtensionManifest",
        "properties": {
          "chrome_url_overrides": {
            "type": "object",
            "optional": true,
            "properties": {
              "newtab": {
                "$ref": "ExtensionURL",
                "optional": true,
                "preprocess": "localize"
              },
              "bookmarks": {
                "unsupported": true,
                "$ref": "ExtensionURL",
                "optional": true,
                "preprocess": "localize"
              },
              "history": {
                "unsupported": true,
                "$ref": "ExtensionURL",
                "optional": true,
                "preprocess": "localize"
              }
            }
          }
        }
      }
    ]
  }
]