Iceweasel 3.5.8

Iceweasel being a minor repackaging of Firefox I expected Firepgp to work, but on Gmail Compose new message window there are no control buttons to Encrypt/Sign etc. The Tools menu does contain and installed FireGPG menu, however selecting some text in a message followed by Tools.FirePGP.Encrypt followed by OK does not insert encrypted text to replace the selected text.

I am running Crunchbang Linux 10 based on Debian.

Much obliged for any suggestions.....