to write right to left

Hallo
I was looking for an extension in order to be able to write from right 
to left.
There is a bidimail in Mozilla.org.il, but I can not install it to 
Thunderbird.
I deed before, but now it is impossible. I do not know the reason.
If I try to update Bidimail, I get e message, that it was stopped, no 
updates...
The bidimail is installed, but not the one button of changing r-->l

Coulf you pl. help and advice me what to do?

Thank you so much

Diza
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