Add video/x-mng to the Accept header. Patch by Peter Janes

<peterj@liberate.com>, bug 118979, r=bzbarsky, sr=darin

modules/libpref/src/init/all.js

@@ -378,7 +378,7 @@ pref("network.http.connect.timeout",  30);	// in seconds
 pref("network.http.request.timeout", 120);	// in seconds
 
 // Headers
-pref("network.http.accept.default", "text/xml, application/xml, application/xhtml+xml, text/html;q=0.9, image/png, image/jpeg, image/gif;q=0.2, text/plain;q=0.8, text/css, */*;q=0.1");
+pref("network.http.accept.default", "text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif;q=0.2,text/css,*/*;q=0.1");
 
 pref("network.http.sendRefererHeader",      2); // 0=don't send any, 1=send only on clicks, 2=send on image requests as well