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от Пользователь Firefox 9717b9 Сен. 19, 2020 · permalink

Warning: the integration of "Lightning" into Thunderbird (78.2.2) no longer allows "Calendar Tweaks" to function properly. Had to roll my Thunderbird back to an earlier version (along with an earlier version of my profile) to get "Calendar Tweaks" back the way it was (a very good add-on). Won't upgrade Thunderbird again until the problem is fixed.