WebAssembly is not defined when signing in with Safer Tor Browser security level.

[MarinoJurisic]

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When attempting to sign in to ProtonMail using the .onion endpoint (mail.protonmailrmez3lotccipshtkleegetolb73fuirgj7r4o4vfu7ozyd.onion) with Tor Browser 13.5.7 and the browser Security Level set to Safer there is the error "WebAssembly is not defined".

The Safer security level currently disables WebAssembly so guessing appropriate fallbacks were not included with the latest deployed version of the ProtonMail web client.

Sign in page has version 5.0.174.4 on the footer.