[Bug 1905337]

[Stransky]

X11 does not support it AFAIK. Please try Wayland desktop in Ubuntu
20.04 although the support is still not 100% perfect - there are some
glitches when window is moved across monitors and popups are sometimes
invisible - but that will be fixed.

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https://bugs.launchpad.net/bugs/1905337

Title:
  Scaling of Firefox doesn't adjust when moved across Monitors with
  Different DPis

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