I recently helped move the Firefox snap to use core18 and the new gnome-3-28 extension. From my initial manual testing, it seems to work fine. However, there seems to be an issue with review and submission to the snap store.
Please do let me know if I did something wrong.
I manually reviewed the snap and issued a snap declaration for use of the org.mozilla.firefox well-known DBus name. Future uploads should now pass automated review. I reran the tests on r288 and it passed, r289 is queued for automated review and should pass soon.
Awesome, thanks for your help.