Is it possible to use workers in a Greasemonkey script?

I would like to use the Web Worker facility introduced in Firefox 3.5 to enhance a Greasemonkey script I'm working on. Is this even possible? I've done some experimentation, but I can't get past the issue of loading a worker script from an arbitrary domain. For example, this does not work: ``` var myWorker = new Worker("http://dl.getdropbox.com/u/93604/js/worker.js"); ``` This code generates an error message in my Firebug console: Failed to load script: http://dl.getdropbox.com/u/93604/js/worker.js (nsresult = 0x805303f4) Apparently there's a limitation that does not allow you to start a worker from a URL that's not relative to the base URL of the calling script. You can load a worker script at a relative URL like this just fine: ``` var myWorker = new Worker("worker.js"); ``` But there's no way for me to get the worker script on the user's filesystem so that it could be at a path relative to the calling script. Am I screwed here? Should I give up on trying to use workers within my Greasemonkey script?