Hi, thanks for your comments. You can type help to see a list of commands that are support.
To answer your question about cd, mv, nano, etc I made this in the few hours I had yesterday afternoon, so I'm afraid I only had time to implement a small subset of commands.
I've now put it up on GitHub (https://github.com/grbsn/web-sh). I hope people can use it as a starting point to build their own web based console applications. Let's see how it goes!
A list of the available commands would help! And I would love to see this, anyway, in Firefox Marketplace!
Also: do you want to treat it as close source software? If not, you host the source code somewhere, in order to allow contributions.