Oh, well... It was worth trying.
It's strange, though. I've searched and found some Imgur/Firefox issues, but they've been few and far between. You might try contacting Imgur.
I did try. They're pretty much into canned response mode. Your assistance was far more impressive.
Have you tried with Safari? Even your legacy version may work.
Every time I try Safari it frustrates the hell out of me.
And there's always DropBox.
I don't know from DropBox. For the moment I'm going to stick with what I know.