Blurry letters on websites when scrolling in Firefox 19 (with either smooth scrolling enabled or disabled)

Hello,
Just recently I updated to Firefox 19, and since I had some problems when scrolling on websites: some of the lines/letters get blurred.
I did some online research and found a tip of deactivating smooth scrolling, so I did that, re-started Firefox, but the issue was still not solved.
I did not have this problem until the recent upgrade.
Is this a known issue? Is there a solution to this?
If not, how can I go back to the previous version of Firefox, I can only find download links to the latest version....
Thanks,
Lars

Hi Lars, you said : ''EDIT: could it be that in the previous version of Firefox the hardware acceleration was disabled by default and in the latest version it's enabled by default? ''
hardware acceleration is enable always in the versions, probably something with Bug 825205 - WebGL index validation fails when a large attribute buffer is bound, that fixed in new version see: https://www.mozilla.org/en-US/firefox/19.0/releasenotes/
''Does this somehow mean I have an outdated graphics card? ''
you can check it, but if working without problem with hardware acceleration was disabled, for me, leave it as it is. !
thank again

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