Normally, I am able to select any number of things (text from web pages, URLs, etc) and copy them to other other applications, but occasionally the ability to copy to the system clipboard seems to stop working, in that I am unable to copy to other applications, and my system clipboard indicator shows no activity. Restarting Firefox is the only way I've found to resolve this behavior. (This is annoying because it doesn't seem to remember my window positions, but that's probably another issue.) However, within Firefox (between tabs, tabs to controls, etc), the clipboard continues to work fine. I can also continue to paste to Firefox from other applications. I'm running Gnome/Mutter/Wayland (Fedora 33). Any ideas what could be causing this?