Bug#808228: iceweasel disables unsigned addons installed via xul-ext packages

[Daniel Kahn Gillmor]

On Thu 2015-12-17 07:53:43 -0500, Martin Steigerwald wrote:

> xpinstall.signatures.required is set to true here.
>
> I set to false for now in order to use the addons again. This works.

fwiw, i also needed to set xpinstall.whitelist.required to false to use
the system-installed addons on iceweasel 43.0.

    --dkg