Comment 4 for bug 588311

The issue is that Firefox 3.6 doesn't honour the GNOME font preferences (which is bug 559149). The fontconfig settings I gave you will set the hinting to the same setting you already have in your preferences, so the font rendering in Firefox should closely match the rendering in your other applications. The rendering in Hardy with these settings looks the same as 3.6 on Lucid here.

Remember that there will be some noticeable differences between 3.0 and 3.6 in hardy - this is not a normal minor update