> A buggy extension is also possible... see: > http://forums.mozillazine.org/viewtopic.php?t=354828#2051115 Known Leaky Extensions The following extensions are known to have memory leaks: Fixed Adblock 0.5.3.042 <boing!> that and hacking the diff to 1.5.1 seems to have staunched the flow. thank you and all the others who gave me clue along the way. randy