How can I get the UR toolbar buttons into the portable version of Firefox?

[TimP]

I'm using the PortableApps version of Firefox and the portable version of UR. I'm pretty happy to be able to lug these things around with me on a highspeed USB stick because I work as a contractor on a customer's site who doesn't like me installing my tools on their computers.

I'd like to have those nice little UR toolbar buttons installed in my portable version of Firefox. Is there a manual version of the trick that the UR installation tool performs to get these things to appear?

Dragging and dropping works, I know, but the Firefox toolbar buttons are neat and tidy no matter how all the windows on my desktop are arranged.

[kinook]

http://www.kinook.com/UR/Manual/firefoxintegration.htm