While D224214 of Bug 1921426 fixes the issue for Firefox, it does not make our test pass again. Additionally, Thunderbird has to deal with Bug 1921974.
Bug 1921436 Comment 1 Edit History
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While D224214 of Bug 1921426 fixes the issue for Firefox, it does not yet make our test pass again. Additionally, Thunderbird has to deal with Bug 1921974.