Yes, very much regrettably, I now find myself using Chrome when I really would like to avoid that. But unfortunately there is no way around this right now that I've found to be reliable enough and easy enough to the point that I would advise users to go that route. Sorry.
Note this 8(!) year old bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=836897
It's embarrassing.