Several days ago, Safari popped up an error message saying TrafficLight could not be loaded. Checking Safari extensions, TrafficLight had disappeared from the list. Have tried to re-install TrafficLight several times since, but always get an error message, "An error occurred while installing the extension TrafficLight." On the Apple Extensions website, I keep getting the message "This developer’s server appears to be busy...Please try again later" when I attempt to install TrafficLight from there. I'm not aware of any recent Safari updates, so am confused as to what could be the cause. Safari 5.1.2, Mac OS X 10.6.8, 3.2 GHz Intel i3, iMac 11,3.