Firefox and no problems for weeks.
EDIT: I take that back - one problem, since about the time they had that problem with images several months back (can't remember exactly what, only that it was media related and they had to do some work. Ever since that fix, any time I try to download an image, it converts to an .avif, no matter what the native file is. I'm on a few other sites where I download images, and none of them do this, so it isn't FF alone. Brought it up to the powers that be, they claimed to look at something, and then just marked it "complete" with no action. Probably something to do with an add-on that has a conflict or bad interaction with whatever they did here, but, since the mods here are such wonderful professionals, they just dismissed it with basically a "tough luck" kind of comment. Don't know if anyone else has noticed the same kind of issue, but I find it annoying as fuck. Just like certain mods...