When running firefox-bin on Plasma 6 RC2 Wayland, it seems that it gets a generic placeholder Wayland icon in the alt-tab switcher and the title bar. It is however associated with the correct icon in the task manager. A workaround for this is to add `--name=firefox-bin` to the launch parameters. This presumably allows KDE to find the correct desktop file, and then set the correct icon etc. (I'm not an expert on how all this stuff works, sorry!) This should probably be handled in the startup script for firefox-bin, so that it will behave correctly? Although some forum posts I found seemed to indicate that `--name=firefox` should be correct, so I'm a bit confused. https://forums.gentoo.org/viewtopic-p-8798292.html https://forums.gentoo.org/viewtopic-t-1129209-start-0.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1826330 probably related. I wanted to set up a VM with KDE to test this, but I most likely won't have time for that.
