> Do we know all the Opus+Firefox 148 bugs are fixed in Firefox 150? Do we know the number of new bugs introduced per Firefox release?

That may be parsable from their bug tracker, though I don't know of all bugs raised by mythos are public.

I'd be particularly interested in how many of the bugs found existed in 148. Assuming most or all of them weren't newly created bugs added in 149 or 150, the comparison should still hold even though Opus and Mythos looked at different releases.