[Greasemonkey] Can greasemonkey set user prefs?

[beejamin]

Hi all,

Looked around for an answer to this, but to no avail.

Is it possible for a greasemonkey script to alter any of the Firefox
settings (normally set in prefs.js or User.js on the fly? 

I understand the ability to do this would be a major security hole for a
public website. I'm trying to find a way to select/change print settings per
page on an internal web app (not public-facing). Specifially, I'd like to be
able to set the default printer and margins when the user loads a particular
page.

Greasemonkey is looking like the most likely option, though I have the
suspicion that Firefox is going to deny this sort of request because it has
the potential for such damage.

Any ideas? Thanks in advance!

Beej


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