Contrary to the suggested browser Kiwi which is discontinued I'd suggest Yandex browser in android which supports extensions.

Brave mobile doesn't allow extensions/addons, so your only bet on Android is Firefox. If you're on iOS, IIRC Firefox on iOS doesn't support extensions, so tough luck ;_;

Kiwi browser has full extension support. Firefox for android is scheduled to drop support for all extensions except ONE. And add them back with time.

Thus I've not updated mine in weeks. So I don't know the status of the version on play store.

If you're on Android, then switch to Kiwi Browser which allows extensions.