Users who have upgraded to Firefox 4, particularly those who are on Windows, have noticed that fonts on webpages are blurred that makes reading difficult or just plain annoying. This is a result of hardware acceleration, as gHacks points out.
Now turning off hardware acceleration from the Firefox’s options menu is one way to fix the font rendering problem. But this is not an ideal solution as it can affect page rendering too. The Anti-Aliasing Tuner, on the other hand, will help you correct font display issues without touching other areas of the browser or negatively affecting browser performance.
Anti-Aliasing Tuner offers a granular control over Firefox’s font rendering settings.
The addon offers two sets of identical configuration options one for small fonts and one for large. The threshold size between the large and small fonts is set at 16 points, but can be adjusted to any figure as the user sees fit.
There are several font rendering modes such as GDI Classic, GDI Natural, Natural Symmetric and Outline. Then there anti-aliasing modes such as ClearType and Greyscale. You can also adjust the ClearType level and contrast.
The image below shows the results with ClearType chosen as the anti-aliasing mode and GDI Natural as the rendering mode. You can see a definite improvement in rendering and readability of the text.