Not surprising, considering the (new) reddit website has the most bloated, sluggish UI I've ever used. And the only change they made recently made it worse as it added autoplaying livestreams.
google.com was bouncing around 1 and 3%. Firefox becomes unusable for me to do webdev on with multiple tabs if each tab is doing 5%+ each.
Is there a bug with more details on this?
I have noticed there are some websites that tend to make it both consume CPU and prevent my machine from screen-blanking, but I find them easily enough with the the diagnostics tool in ff. I don't recall having that problem with Chromium, but I feel like I've given it up for good now.
I looked at the bug again with fresh eyes and it seems like there is a deeper issue that may be my fault.
I am running i3-wm and it seems like Firefox gets stuck in a loop if you don't have all the fonts it expects. I had a previous issue where I was crashing my terminal when a program tried to show emojis, which was a legitimately a fun issue to figure out.
https://bugzilla.mozilla.org/show_bug.cgi?id=1495900
https://bugzilla.mozilla.org/show_bug.cgi?id=1499385 (not sure if this was the one I saw before giving up + installing Brave, but the fact there are _tons_ of "Firefox hitting 100% cpu" is telling)
I may work on fixing this locally, but I may just stick with Brave since it works just fine.
They have a years old bug they can't / won't fix that causes stock Firefox to be at 100% CPU constantly, regardless of what you are running.
I finally switched to Brave and amazingly, it manages to run basic websites at minimal CPU. And it isn't like I am running some rinky-dink computer. I have 32GB of RAM and a Ryzen 9 3900x.
EDIT: Single tab of the front page of reddit, no add-ons, nothing loading, Firefox goes between 7% and 21% CPU. Meanwhile I have 20 tabs open in Brave and it is sipping between 0.7% - 3%.