[jacquesm]

I have hundreds (not kidding here, it's the nature of my work) of tabs open routinely for days or even weeks on end and this is not an issue for me. This is under Linux (which may be a factor) on a machine with plenty of RAM (which may be another factor), firefox is extremely stable and if it goes down it is because I power off the machine.

Do you have any plug-ins or add-ons installed that might be the cause of this problem? If you do I suggest you disable all plug-ins and then slowly re-enable them to figure out if any one of those is the culprit.