My vision of a perfect SuperGenPass extension
This extension gives you the mobile version of SuperGenPass in a popup panel. The URL is filled automatically based on the frontmost page, you can press enter to generate the password which gets selected, so you can copy is straight away.
This is pretty much the site from supergenpass.com/mobile, with only little modifications.
You can find the source code at https://github.com/benol/MySuperGenPass