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For me, it only works on Forwarding messages, even then, Fwd is not converted to FW, and on replies does not work at all

Это отзыв для предыдущей версии этого дополнения (1.4). 

Hello Grey Sephiroth -

Thanks for comment. Let me answer one by one:
* I'm using it personally and many users are using it. Currently RWH doesn't work on Thunderbird 52.*, which is already shown on Mozilla about non-compability. I'm working on it, v1.5 will have support. I strongly encourage to open an issue on Github (Goto Add-on preferences -> About Tab -> Report Issue)
* "Fwd is not converted to FW" - Have you checked the checkbox on Misc Tab for this feature to work?

Please create an issue with details which can help me find an issue and fix. I hope after the fix you will revisit to this comment and provide full star :) (look forward to it)

Regards,
Jeeva