Great addon! Rated 5 out of 5 stars
Love it. It does what it promises and does it really well. Unfortunately there are some sites that the addon doesn't work really well with. I strongly recommend to add whitelist so we can add sites which "Clean Links" will ignore. Switching "Clean Links" on and off won't do.This review is for a previous version of the add-on (188.8.131.52-signed.1-signed).
It has a configurable whitelist already on the Add-On Manager's options, look for "Skip Links Matching with..."
These options requires Fx 4+, though.