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If any of this has bothered you - then BiDi Mail UI is the (imperfect) solution to your problems! Key features and if you have a message with text in more than one character set encoding, you're out of luck, because you can only choose exactly one encoding for the whole message. Sometimes, you receive emails with Arabic/Farsi/Hebrew content, which show up as gibberish, because Thunderbird didn't correctly determine their character set encoding - and you have to set it manually.And let's not even talk about setting directions on a paragraph-by-paragraph level! None of that.When you compose messages, it's the same thing: The composition window assumes you're writing LTR content only.and so are the HTML messages, if they don't have explicit direction settings/ The text emails you receive are always rendered in left-to-right (LTR) direction, regardless of their langauge.Thunderbird is based on Mozilla/Firefox, and Firefox supports webpages in those languages, right? So, surely Thunderbird must have bidirectional capabilities and support, right? Wrong :-( So, you use the Thunderbird mail client, and you send or receive email in a right-to-left (RTL) language, such as Arabic, Farsi or Hebrew. BiDI Mail UI: Improved bidirectional & Right-to-Left language support for Thunderbird