[scottjad]

And what about other xulrunner applications, such as Conkeror? Do their extensions need to be signed by Mozilla?

So if I use a xulrunner based app, and I want to run a Firefox extension (like ABP, mozrepl, etc), right now all I have to do is edit it's install.rdf and whitelist my application, and if there's a signature (META-INF folder), delete that. In this scheme, as I understand it, that would not work, unless I was running the Firefox Developer edition or had an app popular enough to get developers to include it in their whitelist before signing, and even then there would be plenty of exceptions.

So now no one can run my xulrunner based app (with extensions) with the normal firefox installed on their system (or likely available in their distro package repository).

Please tell me this won't apply to apps launched via xulrunner or firefox -app (with the normal firefox).

[Ded7xSEoPKYNsDd]

The initial announcement said, that there are no immediate plans to enable this for Thunderbird. I'd guess it's just a compile-time flag in .mozconfig. In that case it would affect firefox -app. (But I didn't bother to actually look at the source!)