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由 Zverik 发表于 Jan. 12, 2015 · 永久链接

Great add-on, though suffers from some bad management decisions. To restore old tray icon (with left click and message count), open preferences, "advanced→config editor", find "with_appindicator" and set it to false. Then restart Thunderbird.

Source: https://github.com/foudfou/FireTray/issues/147#issuecomment-68603942