Rated 5 out of 5 stars

gmail_manager-0.6.4.1.1, hosted on GitHub : 0.6.4.1 fixed and addon upgraded to 6.* compatibility=> https://github.com/downloads/ath0mas/mozilla-firefox-addons/gmail_manager-0.6.4.1.1-fx+sm.xpiThanks to Divrsit's fix (https://addons.mozilla.org/fr/firefox/addon/gmail-manager/reviews/310598/)