Saft is an add-on to the Mac OS X web browser Safari which provides a handful of features, including full-screen and kiosk browsing modes, find-as-you-type, history search, "control-drag" to push a large page around, and a bunch of little things you may have wished you had, like "open tab in new window" or "always open browser window in tab." $10.

Firefox has many of these features, and I'm a Firefox fan, on all platforms, for a bajillion reasons. It turns out, however, that I use Safari most on Mac OS X, perhaps due to loading speed or just habit, and it may very well be worth $10 to get the features I miss into the browser I use rather than switch tools.