Well, if you go to the "Appearance" preference pane, down at the bottom there's a section where you can turn off font smoothing below a certain size, and can choose the font smoothing style that looks the best to you.
Apple's defaults are usually fine, but if you don't like the way the default smoothing style looks try the others and see if one is more to your taste.
I believe the changes only take effect with applications opened after you change the setting, so to make sure you're actually seeing the difference, I'd quit the web browser, change the setting, close System Prefs for good measure, then reopen the web browser and see how it looks.