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Firefox will not move in black.

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I am using Ubuntu 18.04 aarch64, I restarted the OS and start firefox, the screen will not be displayed in black.

I am using Ubuntu 18.04 aarch64, I restarted the OS and start firefox, the screen will not be displayed in black.
Attached screenshots

Modified by zel_countbaster

All Replies (2)

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Confusing here what is the "black" defining here?

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Black screen Window