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No button close, minimize

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I dont have minimize and close button - I refreshed firefox and I reinstalled but problem still exsist. Problem occurs also in thunderbird. The buttons look like they are under the cover My comp PC - win 7, firefox 81.0.2 (64 bity), thunderbird 78.3.2 (32 bity)

I dont have minimize and close button - I refreshed firefox and I reinstalled but problem still exsist. Problem occurs also in thunderbird. The buttons look like they are under the cover My comp PC - win 7, firefox 81.0.2 (64 bity), thunderbird 78.3.2 (32 bity)
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