Rated 5 out of 5 stars

https://addons.mozilla.org/en-US/firefox/downloads/file/65919/gmail_manager-0.5.7.5-fx+sm.xpi

Thank you!

This review is for a previous version of the add-on (0.5.7.5). 

This has been fixed in the latest release which has been available for almost a week now. Thanks.