small usability changes

Hi, thanks for your work on this extension.

I made small changes to
* hide the "New Profile" option while not "isOptions"
* when loading a Profile which does not specify a domain, fill in the location of the active tab instead of ""

If you don't want to include these changes, I might publish my fork in the Chrome Web Store.

I tested my changes in Chrome 24 Stable on Win7.

Greetings
Chris