Firefox/Waterfox slowing windows 7 to a crawl

I've been going back and forth between FFox and WaterFox for a couple days now. I thought there was a conflict w/having the 2 on the same OS at the same time but I was wrong.
I now have only WF on Win 7 home. I have hardware acceleration turned off.
When I open WFox (FF when it was installed) it sometimes works fine. Eventually my pc will slow to a crawl and 3 or 4 minutes it will lock. (never ever used to do this). Sometimes opening WR will result in no GUI and eventually it will freeze everything up.
Just now...it froze everything up. I managed to get process explorer open and I killed WF at which point everything returned to normal. It took 5 minutes because there was a 30 second gap between each 'movement'. It wasn't even possible w/a mouse, had to do it all by KB.
I've scrubbed it off my PC. and reinstalled a bunch of times. I don't think it's addons as I've had the same ones for quite a while.
Can't do the trouble shooting information thing cuz i'm in IE (the horror).

Will Firefox start up to the profile manager? If so, try creating a new Firefox profile and see whether you can get to the default home page.
With Firefox closed, you can start up in the Profile Manager using Start > search box (or Run):
firefox.exe -P
Any time you want to switch profiles, exit Firefox and return to this dialog.
When creating a new profile, I recommend using the default location suggested, and to avoid data loss, not re-using any existing folder. Before deleting unneeded profiles, I suggest making a backup first in case something were to go wrong.
Any reduction in the grinding?

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