That is an interesting hack you did there.

The NukeAnything object is still defined but it seems the new security measures in firefox restrict the scope access to this object. So you cannot access it from anywhere else but the extension itself.

I think there must be a was to explicitly add a possibility for other scripts to send messages to it.
I will add that it to the TODO list for next update :-)

Can you drop me a mail with more info about your setup so I can test and make sure it works? What are you using to trigger the gestures?