Downloaded recent Firefox update. Restarted PC. Logged into a site I use (and need this season). I could not even use a saved bookmark for login page. Cannot log in to it. I added the site under Firefox settings option. I tried logging in with Private mode, where I was able to use bookmark for login page. HOWEVER, I quickly experienced issues and got attached warnings. I reported 'site not working' on the debug option. While this usually immediately fixes a problem, it did nothing at all. This is why I am always AFRAID of installing the "Updates" - I frequently lose functions. It takes as TREMENDOUS amount of time to fix them and there is no "help button" on Firefox or Mozilla to scan issue and fix it.