Not working anymore Rated 3 out of 5 stars

Unfortunately it does not work properly any more since upgrading to 4.0 beta 8. Once add-on installed and restarting the browser the add-on works fine, with a another restart of Firefox it does not recognize the add-on any more. It only works again after de-installation and reinstalling again!
Any solution?

This review is for a previous version of the add-on (2010.