SUMMARY When running Firefox (79), it does not respect the panel's "Always Visible" policy and goes under the panel in the maximized mode STEPS TO REPRODUCE 1. Set MOZ_ENABLE_WAYLAND=1 environment variable to make Firefox run on Wayland 2. Set panel's policy is set to "Always Visible" 3. Maximize Firefox OBSERVED RESULT The Firefox's window goes below the panel. And if the panel is at the bottom it hides the "Find In Page" bar. EXPECTED RESULT Firefox must not go under the panel when maximized SOFTWARE/OS VERSIONS Linux: Kubuntu 20.10 (development branch) KDE Plasma Version: 5.19.4 KDE Frameworks Version: 5.73.0 Qt Version: 5.14.2 ADDITIONAL INFORMATION All the other apps (Qt, GTK and XWayland) respect the panel's policy and do not go under when maximized. This does not seem to be the same issue as described in 409905.
On neon unstable, Firefox 79 running natively on Wayland only goes below plasma panel on bottom on opening. Operating System: KDE neon Unstable Edition KDE Plasma Version: 5.19.80 KDE Frameworks Version: 5.74.0 Qt Version: 5.14.2
This seems to affect not only Firefox but also other applications. I have observed it with Dolphin, Konsole, Kwrite, Chromium, Kate, and others. Usually a restore & maximize makes the window respect the panel. This bug is also still present in 5.19.90.
*** This bug has been marked as a duplicate of bug 432326 ***