I tried Orion (m1 MBP) recently. From about 3wks ago til a few days ago. I liked the UI. But there were a lot of pages that didn’t work correctly. I persevered for a while. But gave up a few days ago and went back to Brave.

I know it’s WebKit. But they are somehow allowing extensions, which none of the other iOS browsers has managed afaik.

Likely just emulating/providing the javascript interfaces needed for FF and Chrome extensions to run.