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it comes to normal, unless the focus is switched to another window and then go back to it....
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will it be fixed?
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
- Don't make any changes on the Safe mode start window.
Do you have an example page where you see that happen?