I understand why the developer re-wrote the extension to work with Firefox's future requirements... BUT the implementation of going from 3.5 to 4.0 was NOT smooth. Give users a warning or the option to back up our saved settings and import into the new version. Like another user said, I can only click on one e-mail at a time to launch. Used to be able to one click and open all e-mail accounts with messages. This app needs a lot of fine tuning to get it back up to par with the old version.