can PDF state be cleared?

Not sure if this is the best group for this question, but I figured I'd 
give it a shot...

When Firefox loads a PDF file and the user changes pages and re-scales 
it, etc, those same PDF document settings are retained when FF reloads 
that same PDF document later.  This is true even if I clear all my 
browsing history (every option available) and restart Firefox.

For my particular add-on needs, this information needs to get wiped. 
I'm assuming the acrobat reader plugin is storing this info somewhere on 
its own, but my question is - is there a way to programatically clear 
this info from within my addon?  (rather than thru some option inside 
the acroreader itself).