I had some issues with that in 10.3.8 and .9 with Firefox, too... but haven't seen it since I upgraded to Tiger (although this might be because I have been using Safari since the upgrade, and only a couple of hours ago got my Fox back...😉)
12" iBook G4@800, 640 MB RAM, ATI Mobility Radeon 9200
The main lines in any of my Safari windows are definitely bold and slightly blotchy. I can't seem to be able to get it to the way it was in Panther either, neither through Sys Prefs or Safari Appearance pref. Anyone figure this one out yet?
Did you reboot after turning it off? It was on by default by my iBook, and once I disabled, I had to reboot for the anti-aliasing changes to take effect.
Did you reboot after turning it off? It was on by default by my iBook, and once I disabled, I had to reboot for the anti-aliasing changes to take effect.