The GTK file picker Firefox wants to use by default is meh. I'm not sure why it doesn't use the one provided by the OS when it's just one about:config tweak away. Change widget.use-xdg-desktop-portal.file-picker from 2 to 1 and you get the much, much better KDE file picker. Assuming you're using @kde of course.

It's been a problem for ages on multiple operating systems, not a new thing. At least now you don't have to set environment variables and change startup scripts.

0

If you have a fediverse account, you can quote this note from your own instance. Search https://masto.ai/users/jimp/statuses/116201431862114945 on your instance and quote it. (Note that quoting is not supported in Mastodon.)