Hugh Problem with Firefox and Debian 12

[Maureen Thomas]

I am using an updated Debian 12 with Thurderbird and Firefox. Since the 
updated firefox I can not use it as it freezes my computer to the point 
that I have to hold the off button on the computer for about 10 seconds 
before it turns off.  I am using Chrominum and I hate it.  I have a VPN 
but I still don't trust anything from Google.  I forgot how to remove 
the update and use the older version.  At 74 I am forgetting a lot of 
things I did before, I mean years ago.  I hate to keep bugging you guys 
but I refuse to use Winblows.  Can someone please help me out.

Moe