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I've used 6 different Macs over the past decade and none of them have ever had this issue. I'm not saying that you're wrong about your experience, but that it's not like it affects 100% of Firefox's quite large Mac userbase.

It may not be in the release notes, but this release has some performance improvements specifically on OSX.

I'm having the same experience: high CPU usage, slow typing response and big battery usage. Will see if 61.0 helps at all.

What issues do you hit? I've been running on two MacBook Pros (one mid-2012, one mid-2015) and never had any issues. Everything's smooth as butter.

I think the last time I ran into this issue it was a bug involving DPI scaling. If you're not running at the "default" scale, you'll have performance problems.

I also have performance issues. High CPU usage with minimal tabs. I regularly see 20% of a core with around 10 tabs open.