Apple has put a bullet in JS extensions, so this project is dead.

Github user @Sh1d0w has created an alternative to this project using Safari App Extensions. I haven't tried it yet, but you can find it over here:

Classic README Contents:

Safari extension that strips tracking tokens from the following services:

The Google Analytics query string parameters are documented here

Based on the work of Jon Parise as well as the work of Mihai Parparita

Bookmarklet version available here, created by @kid1ng (for use on mobile devices)