it happens more often when I scroll the webpage with mouse wheel
a zoom-in or zoom-out (by Ctrl-mouse wheel rolling) could refresh the display to normal
reinstalling firefox did not solved the problem
Go to Solution.
Could you try disabling graphics hardware acceleration? Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.
You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).
Then perform these steps:
Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:
Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems
Upgrade your graphics drivers to use hardware acceleration and WebGL
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problem solved. thank you!