I do understand why NaCL and PNaCL are undesirable and why wasm is much better, but as a student the NaCL ssh app had saved my computer science homeworks more than once, and this is something that still doesn't have an alternative although I rarely would need it nowadays.
https://ssheasy.com/
https://www.google.com/search?q=wasm+ssh+client
...the future is here!
I think the whole NaCL thing was able to do the ssh directly from the browser without any tunneling, but maybe I am misremembering