[Bug 1802039]

[Aliakbarmostafaei-k]

(In reply to ollihcnivad from comment #7)
> This is still happening in Ubuntu Mate 20.04 with Firefox 85.0. Any updates?

The `mate-netbook` is the culprit, removing it (sudo apt remove mate-
netbook mate-netbook-common) will fix this.

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https://bugs.launchpad.net/bugs/1802039

Title:
  Firefox without titlebar has visual glitches when
  maximizing/unmaximizing

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