It works pretty well but Edge/Chrome feel better than FF on mobile. Scrolling performance is probably the biggest difference. I've had issues with using FF as the default webview too.

From my perspective, scrolling performance is a minor annoyance, whereas the inability to block ads is basically a complete showstopper.

Fells better even with all the ads and other annoyances uBO blocks? I've never noticed a scrolling performance issue myself, let alone one worth tolerating that stuff over.

You can always use Brave. Not quite as good as uBO, but it still blocks most ads while being Chromium-based.