[Greasemonkey] Safely dropping privileges?

[Mook]

Hi,

I want to write a user script that:
1) Does not need any of the elevated privileges provided by Greasemonkey (GM_*)
2) Needs to poke unsafeWindow a lot

Since I don't really want to trust the web site, can I somehow drop my
privileges safely and make sure I don't become a path of exploitation?
 Is the best I can do to iterate through the properties of | window |
and deleting anything matching /^GM_/ ?  (I am mostly afraid of
missing stuff...)

Asking the list because this seems like something many would want, and
yet nobody has mentioned...

--
Mook
mook.moz at gmail