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Message window File dropdown. Widget and children not displaying properly in MacOS Mojave.

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In the message window, using the "File" pull down is unreliable. The pull down widget, and its children to the side, only draws once. After that they either do not instantiate or are invisibly displaced. Repeatable every time in every message window. Thunderbird 52.9.1 on MacOS Mojave 10.14.

In the message window, using the "File" pull down is unreliable. The pull down widget, and its children to the side, only draws once. After that they either do not instantiate or are invisibly displaced. Repeatable every time in every message window. Thunderbird 52.9.1 on MacOS Mojave 10.14.

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There is a similar discussion with a fix here. Maybe of will help you. https://support.mozilla.org/en-US/questions/1235792