Comment 23 for bug 189720

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Fabien Tassin (fta) wrote : Re: [Gutsy backport] Very poor font rendering due to Cairo issues (ragression since FF2)

If you backport only firefox-3.0 and xulrunner-1.9 from hardy to gutsy, that's expected.

You also need to backport cairo (1.5.8) and fontconfig as they contain the sub-pixel LCD filter.
Without those two, xulrunner-1.9 will switch to internal cairo at build time, which is not patched and then ff3 will have no sharp font as you described.