My heavens you're having issues. All of my browsers [Firefox 77.0.1 64-bit, Chrome Version 83.0.4103.106 (Official Build) 64-bit and Edge Version 83.0.478.54 (Official build) 64-bit] are running perfectly on my basic websites so far. To be honest though, Edge is the best browser Microsoft has built so far, but it took me some effort to get rid of Bing and all the other search engines I don't want.
I must admit also that I'm running the WinZip series of system tools that clean up the Registry, Drivers, Browser bits and so on, so there were no known issues per se in my system prior to the 2004 build.
I have had issues with Firefox before the latest round of OS updates running Facebook that grew in memory utilization until over 4GB was used for one process that got slower and slower until it crashed. I'll check over the next few days whether this issue still exists.