Did you know you can enable Direct2D and DirectWrite hardware acceleration in Mozilla Firefox to increase performance? Direct2D and DirectWrite are replacement for the good old GDI in Windows. These 2 new technologies use GPU acceleration to boost overall performance.
But you'll need either Windows 7 or Windows Vista SP2 (with Platform Update installed) to be able to enjoy this method.
Follow these simple steps to enable Direct2D and DirectWrite H/W Acceleration in Mozilla Firefox:
1. Open Firefox and type about:config in the addressbar and press Enter. It’ll confirm, click on I’ll be careful, I promise! button.
2. Now type render in the Filter box and look for following 2 keys:
gfx.font_rendering.directwrite.enabled
mozilla.widget.render-mode
3. The entry "gfx.font_rendering.directwrite.enabled" would be set to false. Double-click on it or right-click on it and select "Toggle". It'll change its value to true.
4. The entry "mozilla.widget.render-mode" would be set to -1. Double-click on it and set its value to 6.

PS: If you can't find "mozilla.widget.render-mode" entry, you'll need to manually create it. Right-click on empty space and select "New -> Integer" and set its name to mozilla.widget.render-mode.
5. That's it. Restart your browser and enjoy better looking fonts and performance.
NOTE: If you want to disable the hardware acceleration, set "gfx.font_rendering.directwrite.enabled" to false and "mozilla.widget.render-mode" to 0.
This article was posted by VG in following section: Mozilla Firefox.
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VG
^^ Try to enable Clear type font and adjust settings using Tuner:
http://www.askvg.com/clear-type-tuner-microsoft-powertoy-for-windows/
http://www.askvg.com/guide-how-to-use-windows-7-built-in-cleartype-text-tuner/
imperial
in my case, the text is not exactly burry, its looks likes is in bold...
Dušan
I've done that on FF 4.0 Beta 4 and after that FF is lagging all the time and letters are blury.
I have Windows 7 64-bit installed, what could be the problem?
VG
^^ Its in beta stage, thats why you might face issues.
imperial
In beta 5 my problem dont happen anymore, and the acceleration comes On by default.
Enterprise
Thanks.