Hi Ralph, This bug was already fixed in 3.0.2[1] and 'network.prefetch-next' has no effect in icedove[2]. So I will revert 'network.prefetch-next=false' in my next upload. Cheers, Christoph [1] https://bugzilla.mozilla.org/show_bug.cgi?id=544745 [2] http://kb.mozillazine.org/Network.prefetch-next