Yes, it is possible to use a cookie editor extension on your Brave browser in Chrome OS. You can search for cookie editor extensions in the Chrome Web Store and install them on your Brave browser.
Here are the steps to follow:
1. Open the Brave browser on your Chrome OS device.
2. Go to the Chrome Web Store and search for a cookie editor extension.
3. Once you find an extension you like, click on the "Add to Chrome" button to install it.
4. Wait for the extension to install and then click on the extension icon in your browser's toolbar.
5. You should now be able to edit and manage cookies using the cookie editor extension on your Brave browser.
Please note that manipulating cookies can have an impact on your browsing experience and may cause issues on certain websites. It is recommended to use cookie editors with caution and only when necessary.