1# Crossbench Proxy extension: Custom replay button in DevTools > Recorder 2 3This extension is using the [chrome.devtools.recorder API](https://developer.chrome.com/docs/extensions/reference/devtools_recorder/). 4 5To test the extension: 6 71. Download this directory to your machine: `git clone https://chromium.googlesource.com/crossbench`. 82. [Load the extension locally](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked). 93. Open a new tab and a new DevTools window. 104. In the **Recorder** panel, create a new recording. 115. Expand the replay menu and press **crossbench**. 12