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I don't think you can use Proton without JS. You need JS for cryptography; the emails get encrypted/decrypted/signed/verified on client-side.

Of course; should have been obvious.

Perhaps there is a greater reliance on scripts in the new version, but this makes it seem more likely that they've abandoned the Tor version.

I use proton-bridge and a normal email client, although I've never tried to use it with Tor.