After I did update from Windows 7 to Windows 8 I have a problem with Mozilla. It shows in some situations strange signs. When I point my mouse over faulty place it becomes ok. I attach print screen:
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Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
- Do NOT click the Reset button on the Safe mode start window or otherwise make changes.
Try to disable hardware acceleration in Firefox.
- Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
Thank you very much !
Disabling Hardware acceleration solved the problem. The newest driver for my graphic card Geforce 8600 gm s didn't work so I installed some old ones. Maybe that's causing the problem.