Hello, try to Turn off hardware acceleration and check it again.

thank you

Hi, thank you for reply, it really works, but is there any solution if I want to have HW acceleration in FF enabled? Could new release of browser fix this problem?

The usage of HW acceleration is related with lots of things, if works, keep it that way see for more info: https://hacks.mozilla.org/2010/09/hardware-acceleration/comment-page-1/

thanks again

thank you very much

Try to set the gfx.content.azure.enabled pref to false or if this didn't help disable Direct2D by setting the gfx.direct2d.disabled pref to true on the about:config page and leave hardware acceleration otherwise enabled.

Thanks, all these solutions work for me. However, I wanna ask one question, if I set "azure" to false, everything will go back to normal (before this problems) or there will be any "downgrade" of displaying in Mozilla? I mean if quality of text will not be worse than before this problems. And will be ClearType enabled? I wanna know if there is any negatives if I set azure to false. I have not only problems with text, but also images, pictures, on Facebook, that small pictures of profile photos in chat, look worse, like they have lower resolution or they are 24-bit or something like that...

Thank you

PS: Sorry for my english :-)

"set the gfx.content.azure.enabled pref to false" worked for me. But i have lost a feature now (what "azure" is useful for ?) I am not happy to lost my time with this annoying problem.