I'm trying to debug a jetpack that keeps track of the amount of time spent in a tab. Unfortunately, associating timer objects with tabs in a way that works in tabs containing iframe is problematic (impossible?), because in Jetpack 0.7 running on Firefox 3.6b5 on Mac OS X, the onReady method for a tab fires once for every iframe in the tab rather than just once for the tab.
Oh man, my bad. I will fix this in the reboot for sure. Thanks for the report!