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If you close the tabs and Firefox keeps using CPU, how's that Google's fault? Or are you suggesting that Google is exploiting some bug in Firefox to have it use CPU time even when the tab is closed?

Not saying that this is the case, but if Google properties use ServiceWorker, this could happen.

Google properties have a history of having suboptimal code served to Firefox.

To be honest, I'm not using that many websites. Maybe 20-30 in total. It is possible that other sites have similar problems, but I noticed with Gmail and YouTube because I use those two a lot.

Or maybe, unlike the rest of the sites, Google engineers don't bother to test stuff on Firefox?

I also started seeing much slower performance in Google Maps and street view in the last few weeks.

Gmail is definitely a problem site for me, but it's not just google sites.