I’ve been Linux in the desktop for years. You really don’t have any choice other than to be a little bit flexible.
More times than not it turns out to be a plugin that screws over the site. Here’s my general path:
Won’t load in Firefox? Disable privacy badger and ublock origin
Still won’t load? Try it in a private window with no extensions loaded
Still won’t load? Move over to brave.
Still won’t work? Disable Shields
Still won’t work? Straight to a vanilla copy of edge, (a vanilla copy of Vivaldi would also be reasonable)
Just last night I ran into a problem with my ADP work portal. Things worked fine for ages, All of a sudden my password wouldn’t work. I went into private mode My password now works but loading the actual page netted me a blank page
I opened it up in brave and it just worked outright.