Comment 13 for bug 957922

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Kannan Sasi (kannan-sasi) wrote : Re: Indicator-Messages should turn blue when new emails land in Thunderbird

A previous bug on the same topic has instructions for the work around.

From Bug 841116 comment 7:

echo 'user_pref("extensions.messagingmenu.attentionForAll", true);' >> ~/.thunderbird/*default*/prefs.js

You could also create a new boolean entry in about:config (Preferences->Advanced->General->ConfigEditor)