Thanks for the reference to the upstream bug Michael.
Here is some comprehensive documentation: https://wiki.mozilla.org/Add-ons/Extension_Signing (see the Timeline section, the preference that you mention was deprecated in Firefox 48, released 5 years ago).
Thanks for the reference to the upstream bug Michael.
Here is some comprehensive documentation: https:/ /wiki.mozilla. org/Add- ons/Extension_ Signing (see the Timeline section, the preference that you mention was deprecated in Firefox 48, released 5 years ago).