Comment by onion2k
I don't think any of the use cases suggested really make sense though. For a compute-intense task like audio or video processing, or for scientific computing where there's likely to be a requirement to fetch a ton of data, the browser is the wrong place to do that work. Build a frontend and make an API that runs on a server somewhere.
As for cryptography, trusting that the WASM build of your preferred library hasn't introduced any problems demonstrates a level of risk tolerance that far exceeds what most people working in cryptography would accept. Besides, browsers have quite good cryptographic APIs built in. :)
> For a compute-intense task
The browser often runs on an immensely powerful computer. It's a waste to use that power only for a dumb terminal. As a matter of fact, my laptop is 6 years old by now, and considerably faster than the VPS on which our backend runs.
I let the browser do things such as data summarizing/charting, and image convolution (in Javascript!). I'm also considering harnassing it for video pre-processing.