FireFox 4 Freezes Rated 3 out of 5 stars

Just installed Firefox 4 and this app now freezes when I try and use Mark All Links as visited...

Please fix and update
Thanks

This review is for a previous version of the add-on (3.3). 

I'm not aware of any problems with the add-on and Firefox 4, and without more information there's nothing I can do to help.

It's probable that there is a conflict with another add-on.
If you disable all other add-ons, does the problem still occur?
If you can tell me what other add-ons you're using, and preferably, which one appears to conflict, I may be able to help.

Also, is it specific to a single website, or does it occur on most sites.