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I tried to do this, and I had to switch back. My setup is that I have loads of tabs open, with a vertical tab manager on the side. And FF has a pretty nice extension for that, plus you can take back some screen space by removing the top tabs using some css.

Anyway, when I have the same tabs and extensions in FF as in Chrome, the FF CPU usage is huge. I tried several things from the web, but nothing helped. Now I'm back on Chrome, which is less nice looking and less convenient, but the CPU usage is barely anything.



I think this is mainly an issue on macOS if you use a vertical sidebar, having to do with supporting it's translucency.

I think there's away to turn this off too, but I don't remember how, sorry.


Where did you hear about the translucency hint?

https://xkcd.com/979/

Not trying to turn HN into a bug hunting board, but I found this:

https://bugzilla.mozilla.org/show_bug.cgi?id=1404042

Might be useful to someone.


I use an MBP 15" 2017 with 16g ram, 300+ tabs open as I type, with tree style tabs on firefox. No issues. I would complain about ram usage, but there is certainly no high cpu usage from vertical tabs.


Are any of your tabs gmail? I think that's the main culprit, but I'm not sure it's the only one. Slack as well.




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