Rated 5 out of 5 stars

le Andi ar Aib. 6, 2014 · buan-nasc

I was looking for such an addon, to omit the signature when working with mailing lists.
Just change the version range in the install.rdf *) to "28.*" and it works like a charm.

*) download the xpi > open it as zip-archive > change the install.rdf