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Odd, hardware acceleration is on in my Win7 and I didn't notice anything.

If you've also got Firefox 3.6 or Chrome installed, compare the rendering side-by-side and you should see the difference.

There is also http://support.mozilla.com/en-US/questions/791489 and some other web pages reporting this problem.

After reading that, I double-checked, and I do see the rendering problem in some sites - I don't use Windows much, luckily.

Looks like for most people the problem is that FF4 is now using direct2d DirectWrite for font rendering where available, and DirectWrite has some issues.

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