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This is an essential plugin or rather should not be a plugin but should be rolled into core and maintained within Thunderbird. I have just upgraded to 3.1.2 only to find out the plugin is out of date and my Thunderbird again does not support RTL.
The next upgrade for Thunderbird should really not launch without a built in RTL support.

And thanks again for the BiDi UI team for filling this whole with a plugin until it's taken over by the core Thunderbird team.

Это отзыв для предыдущей версии этого дополнения (0.9.4). 

If people write the Mozilla Messaging people with this request, it might happen... see also:
https://bugzilla.mozilla.org/show_bug.cgi?id=464436