xul-ext-ublock-origin is disabled by firefox for lack of signature

[Gabriel Parrondo]

After installing xul-ext-ublock-origin with apt-get I opened firefox and it displays a warning that the extension could not be verified with a link to: https://support.mozilla.org/es-AR/kb/add-on-signing-in-firefox?as=u&utm_source=inproduct

There is a way to disable this check in firefox's config, so maybe the package's doc should point that out, or better yet get signed.

$ apt-cache policy xul-ext-ublock-origin
xul-ext-ublock-origin:
  Instalados: 1.6.6+dfsg-1
  Candidato: 1.6.6+dfsg-1
  Tabla de versión:
 *** 1.6.6+dfsg-1 500
        500 http://ar.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
        500 http://ar.archive.ubuntu.com/ubuntu xenial/universe i386 Packages
        100 /var/lib/dpkg/status

$ lsb_release -rd
Description: Ubuntu 16.04 LTS
Release: 16.04

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Sean Whitton (spwhitton)]

Debian packages of Firefox addons cannot be signed. Debian's Firefox carries a patch that turns off signature warnings for addons installed system-wide. One way to resolve this bug would be for Ubuntu's Firefox to carry it too.