Firefox 5 breaks this script
It has come to my attention that upgrading to Firefox 5 will break this script.
At this point, I don't know if the problem is with the script itself or with Greasemonkey. I will investigate, but with my OBDR trip coming up in two short weeks, I don't have a timeframe for when this will be fixed.
If you care about this script and/or this matters to you, keep an eye on this thread for updates.