I see exactly the same problem when trying to install an extension developed in our research project (http://www.hiit.fi/g/reknow/software/dime_webextension-0.42-an+fx.xpi). It works fine with the mozilla.org version of Firefox (I tested both 49.0 and 49.0.2).
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1628014 Title: WebExtension fails to install only on ubuntu packaged firefox To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1628014/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
