Rated 5 out of 5 stars
I love the simplicity and the single-clickness of this add-on. It is ideal for me because I use my laptop at basically 2 locations: at work (with proxy) and at home (without).
The only optimization I could possibly hope for is that quickproxy triggers a 'reload all tabs' action. Because that is what I usually need to do after I switch from one to the other.