I seriously love this and am already making some commands for personal use :)

However is there currently a way to pass parameters to a command? Right now I'm using window.prompt() to get user input. It'd be nice if I could enter something like 'mycommand:parameter1,parameter2'. Maybe an excuse to fork the repo...

Great work though!

EDIT I had only been using the extension on backtick.io before, but when I use it on other pages the console does not appear. This appears to be a problem with the CSS - when I inspect element on the page I can see that the HTML has rendered. By default opacity is set to 0 on the #console div - setting it to 1 fixes the problem.