Comment 10 for bug 733488

I suggest to add a filter action similar to New Mail Attention https://addons.mozilla.org/de/seamonkey/addon/new-mail-attention/?src=api

It features a filter actions that brings attention to the Thunderbird window. However, this is rather intrusive in comparison to the nice coloring of the messaging menu icon offered by this add-on.

Enhancement example for this add-on:
The user sets up one or more filters which catch only the emails he thinks are important and chooses as "actions" for the filter, say, the "Messaging Menu Action" (which has to be developed) and which turns the messaging menu green.