Nice add-on but now crashes with Firefox 3.5.1 Rated 4 out of 5 stars

The Rewind/Fastforward add-on is a really nice utility that comes very handy in some cases. I have been using this add-on since a long time now and have been very satisfied with it but recently with an upgrade to Firefox 3.5.1 and the update of the add-on, the add-on will crash each time I would open a web-page. I have disabled it for now but waiting impatiently for the next upgrade so that this little bug can be wiped off.

This review is for a previous version of the add-on (2.1.2009062501).