On 20 Sep 2014, torys.anderson@gmail.com wrote:

> Hmm.... I don't have a network.protocal-handler.app.mailto. I see:
>
> network.protocal-handler.expose.mailto -> false
> network.protocal-handler.external.mailto -> true
> network.protocal-handler.warn-external.mailto -> false

See, there is no mailto handler in your prefs.js.

> I set email.sh as the handler under Firefox Preferences ->
> Applications -> mailto:

Strange, setting "Firefox Preferences -> Applications -> mailto:" should
set "network.protocal-handler.app.mailto".[1]

Maybe you can try adding it manually in "about:config". Right click on
the column head -> New -> String.

Charles

Footnotes: 
[1] http://kb.mozillazine.org/Network.protocol-handler.app.%28protocol%29