Does this also happen in safe mode? If not, it's a sign that an extension is causing those problems. In that case you can disable all extension and enable them one by one to see which one is causing that problem. The other option would be video card drivers, but that's less likely.

Well in a Safe Mode everything looks as it should so you had right, its a foult of extension, I'll check with on can cose this problem and reply.

ok, i've turn off all the plugins and addons in a "normal mode" but it didnt solve the problem :/ so it have to be something diffrent then extensions maybe some king of settings tweak? I'll reinstal FF and see if it helps.

Hmm, you can make a copy of your profile and try reseting all your preferences by using the safe mode switch. Although I really have no idea how a setting could mess up pages like this.

One more thing though, could you try turning off hardware acceleration? Here is how.

Yes, this is more likely a hardware acceleration problem or a problem with (rendering) specific fonts.

You can do a font test to see if you can identify corrupted font(s).

• http://browserspy.dk/fonts-flash.php?detail=1

You can use this extension to see which fonts are used for selected text.

• fontinfo: https://addons.mozilla.org/firefox/addon/fontinfo/

both of you were right :) Turning off acceleration solve the problem (everyting was readable) but the font was rendered a bit odd (bold and not to good antialiased) so I've check Cor-el advice and found that one of my instaled font was a corrupted (HelveticaNeue) and now when i turn it off everything is displayed perfectly :)

So thanks for your time and advices.

Best regards, Soul