I am experiencing this problem as well. Initially when I just start FF I am able to copy from it to other apps, but quite soon (5-15 min) ability to copy text breaks.
Ubuntu 21.04 Wyaland FF: 94.0+build3-0ubuntu0.21.04.1 XWayland: 2:21.1.1-0ubuntu1
I am experiencing this problem as well.
Initially when I just start FF I am able to copy from it to other apps, but quite soon (5-15 min) ability to copy text breaks.
Ubuntu 21.04 Wyaland 0ubuntu0. 21.04.1
FF: 94.0+build3-
XWayland: 2:21.1.1-0ubuntu1