Sudden cpu activity when browsing websites

Original FF user here so not a newbie. Run all FF updates on a regular basis. Currently on a MacBk Air circa 2020 running Sonoma 14.7.7 I browse twitter on a regular basis. I run various ad blockers: ABP, Adblocker Ultimate & Privacy Badger. Last month or so I've needed to make some adjustments as maybe the X platform has instituted workarounds or something but suddenly I was seeing ads that looked like someone's post, very deceptive. At one point it was necessary to disable Privacy Badger on twitter/X as there was an interference w what I was seeing. That wasn't that long ago, maybe 2-3 wks? Consequently if I saw an ad I needed to do a "block element" thru Adblocker Ultimate & while it was a bit of a bother that was all fine and good no problem. Again, this was all recent. Tonite was different. An ad appeared and somewhere something got entangled and I had to disable the Adblocker Ultimate. I sent them an email to see what's up. Then I had to disable that on twitter so ads appeared. Next I tried to enable ABP again on twitter to see if maybe since I'd disabled it a couple of wks prior maybe it had been updated and would work ok. This is when things really started to go downhill. It worked but too well - was disabling images from news reports and/or someone's posted video. THEN I noticed my cpu was running a bit loud. I tried to disable/test the ad blockers but my cpu was getting louder so I shut down the twitter website altogether.

That didn't help. I checked the Utility monitor and saw my activity monitor climbing as I heard the fan running louder. SO bizarre! I shut down FF altogether and this calmed down the CPU. Next I opened just a general news site - Al Jazeera - to see what would happen. Within about 2-3 mins the CPU started speeding up again. I closed AlJazeera, and just sat there for a few moments and my cpu calmed down. Opened it again same thing. Began speeding up. That's when I came here to file a report//ask qs because this just doesn't ever happen - literally ever. It is not unusual for me to have both a browser page open w 2-3 windows along w a private window open - maybe mltiple windows there - and NO cpu noise going on. Once more I shut down FF completely before reopening a new window. IF I start browsing a news site - like Al Jazeera, it begins running hot again. Twitter, same thing and now my ad blockers seem to be messed up//not working as well. Right now as I type this I have ABP & AdBlocker Ultimate both highlighted as active; Privacy Badger is showing enabled but no activity, Twitter Video Downloader is just sitting there as is typical unless I need it (it's to download videos off of Twitter, works very well too.) That's all I have for add-ons. Right now in just this window everything is calm and quiet. IF I open a news site tho, or social media, anything w a bit of activity on it everything starts humming louder and louder. I just opened FB for a few moments to see if that creates issues and yes it does w/i maybe 2-3 mins of activity. Also: FF Privacy & Security Settings are on Standard. Not sure what else I can provide but please feel free to ask. I may have left something out. I'm hearing the cpu heat up again so getting ready to just shut things down for the night. Thanks to all who helped build FF - really - and thanks to whoever can help resolve whatever's going on now.