What’s up with version 6?
The Safari version was very easy to port over, it is already almost feature complete. There are a few minor things missing, but I hope to add them soon!
A Firefox version is also in the works, but it is so different from Chrome and Safari that it will take a little longer.
This blog now has the official URL of http://scrolltotopbutton.com/ and the extension has been bumped up to version 5.0.2 to just swap all of the links within to the new URL.
(All old links will still work just fine though!)