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由 laikexpert 发表于 Nov. 5, 2011 · 永久链接

Please update Gmail Manager to
gmail_manager-0.6.4.1.4-fx+sm.xpi
to official page in addons.mozila.org

I found this and update and my Gmail Manager working.
Thanks people.

Link:
https://github.com/downloads/athomas/mozilla-firefox-addons/gmail_manager-0.6.4.1.4-fx+sm.xpi