[Greasemonkey] A question from the ignorant

[Andrew Bell]

I've been using greasemonkey via platypus, and it's been pretty handy.  
However, I really hate the way I see the initial version of the page, 
followed by the redisplay of the page with my GM/platypus 
modifications.  Moreover, I'd really like to avoid the bandwidth cost of 
downloading the various things I'm eliminating.

Am I correct in assuming this would require low-level changes in 
Firefox, or some special OS intercept of the http calls , as opposed to 
being within the capabilities of Greasemonkey?

Andrew Bell