[Greasemonkey] Stability of GM & FF?

[Devin]

I'm currently running Firefox 1.5 and Greasemonkey 0.6.4 and I'm running 
into stability problems.

I must admit I'm pounding it pretty hard.  Two pages running scripts 
which update every 5 minutes, along with countdown timers on the title 
bar and some DOM manipulation.

After running this for about an hour I get the "Print" dialog up and 
can't close it.  I simply have to kill firefox and relaunch the pages again.

It sounds like a memory leak issue.  Is there a newer version of Firefox 
or GM which I should be looking at?

Thanks
Devin