Hello dphenry157,
Thanks for the question and welcome to the community. The Firefox addon sometimes encounters a hitch when updating, especially in Firefox 4. The easiest way to resolve this is to simply uninstall the current addon, restart Firefox, install the new one, and restart FF again. This should get up updated to the latest version of the add-on (version 1.0.0.652).
I hope this helps, but if you have any problems with this procedure, or have any other issues, please feel free to contact our support directly.
https://secure.logmein.com/contactus
Regards,
Kevin Watson
Technical Support Representative
LogMeIn, Inc.
Email: kwatson@logmein.com