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Sometime ago when I installed Windows 7 I played around with settings and I knew I changed some settings that affected the font on Firefox. In a few websites, few fonts look weird, it was quite manageable so I didn't mind it. However in other websites, almost all of the font looks weird like this:

Try viewing the image in full screen to see what I mean

How can I fix this?

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You did press ctrl+0 to reset zoom already, right? If you didn't, try that now. – Esa Lakaniemi Oct 21 '11 at 21:46
The fonts do look wrong there, almost "bitmap" like. Can you recall anything about the setting you messed with? – Mr.Wizard Oct 22 '11 at 5:34
@esalaka yup, didn't work, I don't think it's a zoom issue. – IMB Oct 22 '11 at 8:51
@Mr.Wizard that's the problem, I don't recall it since it took a while before I noticed that fonts were looking weird. And it only happens on a occasional websites that I visit, for example fonts look fine here at – IMB Oct 22 '11 at 8:53
Ok I think I solved the problem on that particular website by using the default ClearType Text Tuner in Windows 7, however, it caused problems in other websites like Gmail (screenshot: as well as Superuser (screenshot: BTW the Windows 7 ClearType Text Tuner is very hard to use, there are a lot of choices, and it is so hard to find the perfect settings since the choices look very similar. – IMB Oct 22 '11 at 11:34
up vote 2 down vote accepted

Seems like I found an answer to my own question. After long research I finally found a solution in this site:

I did not use the Anti Aliasing Tuner though, what I did was simply disable Hardware acceleration.

enter image description here

I hope this helps someone in the future.

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