This is a new newsgroup/mailing list that will be used to communicate
compatibility information and breaking changes for upcoming Firefox
releases. We recommend that all add-on developers, especially those who
don't host on addons.mozilla.org, subscribe so that compatibility with
our new rapid releases will be smooth.
If you have questions or wish to discuss something related to
compatibility, please visit our forums at
https://forums.addons.mozilla.org or post to mozilla.dev.extensions.