It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

When I switch to desktop during game with ALT + TAB and then return to game, game is often darkened so that nothing but some text or menu is visible. See attached screenshot.

OS: Manjaro Linux
Kernel: 5.7.19-2
GPU: Radeon RX 580
Driver: amdgpu
Post edited September 16, 2020 by Enginnsson