the on screen keyboard (osk) not working anymore when in full screen. it opens up but immediately closes down. it is working fine when the firefox window is not maximized - in both: tablet mode on and tablet mode off. i have already tried this with no succes: * restart with disabled addons * cleanup * new install (nightly) * switching osk settings in about:config i am on windows 10 with dell 5290 2-in-1 incl. travel keyboard. does anyone else have this problem? is this a known bug? any help/information is appreciated! thanks!