I tried switching completely a month ago for the third time.

Sadly absolutely nothing has happened in a 5 year time-span. The performance on my high-spec i7 Macbook Pro is abysmal. ( same across several company Macbooks ) The fans speed up constantly like they have done it for years. It's completely unusable for "professional" work or just regular multi tab browsing and drains the battery in no time.

Safari, Chrome, Opera, whatever, doesn't have these problems. I actually haven't experienced an application that feels so sluggish and unoptimised in OSX as Firefox. Something is seriously wrong and the dev group must not be prioritising it?

I checked their subreddit and loads of people are fleeing the Mac version, even on the newest nightly builds of quantum - seriously what the hell is going on? Why hasn't "the bug" or whatever been found or defined in clear termes in over 5 years?

The day the app works without serious CPU issues i will uninstall Chrome and go to Firefox, but the handling of this problem makes me worried about the dev groups competence.

When i talked to devs in the subreddit many of them were like "Hey, that sounds weird, should be better in the new nightly, are you sure it's not ..." - an absurd answer in the light of the constant stream of people saying this for years and years - even in this thread i see multiple people saying it's useless on OSX.

To the dev group: Get a Macbook (many devs use them), open Firefox, identify the problem - should have happened 5+ years ago.