Comment 16 for bug 1770587

This is for sure happening on Mac (El Capitan 10.11.6).

I uninstalled Thunderbird (also removing the user/library/Thunderbird directory) and re-installed fresh. I again skipped the new email dialog, set preferences again, and this time customized the tabs bar removing the Chat tab since I do not plan on using that, then clicked the disable Lighting again and restarted Thunderbird. The same interface blocking happened again. So it does not matter if Chat tab is there or not. The interface is completely unusable with the new account dialog open. No link or button clicks work other than the checkbox next to the gandi.net provider and the terms and privacy links. User is completely unable to use Thunderbird at this point.