Add pass-through for mozBackgroundRequest on GM_XHR
Add pass-through for mozBackgroundRequest on GM_XHR

Ventero/greasemonkey,Ventero/greasemonkey,Martii/greasemonkey,the8472/greasemonkey,HasClass0/greasemonkey,Martii/greasemonkey,HasClass0/greasemonkey,the8472/greasemonkey