For me the problem with Firefox on Mac are random CPU spikes, the average idle usage is OK. Or some tab getting stuck and skyrocketing to 100% CPU, killing 10%

For me the problem with Firefox on Mac are random CPU spikes, the average idle usage is OK. Or some tab getting stuck and skyrocketing to 100% CPU, killing 10% of my battery if I don’t notice it in time. If you check on Bugzilla, there are many bug reports about it.