How to resolve black dots on Mozilla Firefox ..
Steps to resolve the black dots issue on the Mozilla Firefox screen :
Open Mozilla Firefox > Tools > Options > Advance > General > Unchecked the "Use hardware acceleration when available"
Note by the Experts : Black dots can be an indication that the graphics display card is overheating or is overclocked. If you enable hardware acceleration then the CPU is used more intensively and that might increase the temperature.
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Mozilla Firefox showing black dots on the screen
Black dots on the Mozilla Firefox