> ## Documentation Index
> Fetch the complete documentation index at: https://momentic.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Browsers

> Supported browsers and Momentic's runtime overrides.

Momentic runs web tests on a Chromium-family browser. Pick one based on the
features your app needs, then set it project-wide or override it per test.

## Supported browsers

* **Chromium** (default). Fast and lightweight, but missing some features of
  full Chrome (e.g. H.264 video playback). May be unstable on graphics-heavy
  sites.
* **Google Chrome**. Full-featured Chrome with H.264, media streaming, WebGL.
  Heavier and slower than Chromium.
* **Chrome for Testing**.
  [Chrome for Testing](https://developer.chrome.com/blog/chrome-for-testing/) is
  maintained by Google specifically for automation.

## Choosing a browser

Set a project-wide default in `momentic.config.yaml`:

```yaml momentic.config.yaml theme={null}
browser:
  defaultBrowserType: Chromium
```

Individual tests override the default from **Test options** in the editor. See
[`browser.defaultBrowserType`](/configuration/browser#browser-defaultbrowsertype)
for the full list of accepted values.

## Runtime overrides

Momentic overrides these browser defaults for consistent results:

| Setting                   | Value                                                                                                               |
| ------------------------- | ------------------------------------------------------------------------------------------------------------------- |
| User agent                | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.6723.31 Safari/537.36 |
| Location                  | 37.7749 by -122.4194 (San Francisco)                                                                                |
| Video auto-play           | Disabled                                                                                                            |
| Chrome browser onboarding | Disabled                                                                                                            |
| Desktop notifications     | Disabled                                                                                                            |