Review for Header Tools Improved by Thomas Hucke
Rated 4 out of 5 stars
Addon did stop working suddenly some time ago (TB 115, HT 4.1).
Neither context menu nor any other menu entry appears in the UI.
Please help - I love it :-)
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Edit:
It seems that the context menu doesn't appear in every mail.
As a workaround I've configured a hotkey which works fine.
To create your own collections, you must have a Mozilla Add-ons account.