New comment by oreo639 on void-packages repository

https://github.com/void-linux/void-packages/issues/36294#issuecomment-1088230512

Comment:
Seems to be a similar issue to this:
https://www.reddit.com/r/gnome/comments/twhsqi/comment/i3fsvll/?utm_source=share&utm_medium=web2x&context=3

As mentioned there, you should be able to work around this by adding `StartupWMClass=firefox-default` to `firefox.desktop` and that works for me. Not sure if this is the correct fix?