TOP extension, but needs Rated 5 out of 5 stars

This is the most useful and versatile FF extension ever, since it allows modification of virtually any HTML page using javascript.

One shortfall is that Greasemonkey changes the HTML only after the page has fully loaded, meaning that any tweaks designed to save load time are rendered useless. Is there a way to intercept and modify the code before it reaches the browser? This would make the ultimate page modification tool!

This review is for a previous version of the add-on (0.7.20070607.0).