Nice addon-- but... Rated 4 out of 5 stars
I liked this addon immensely with Ffox 3.6 (5 stars) --but it appears to need a mod for 4.0. I tested it with a compatibility over-ride, and while it basically worked at preventing tab loading, it totally disabled the closed tabs feature (of TabMixPlus and SessionsManager addons), which it didn't with 3.6. Also, when trying to load unloaded tabs, rather than display the tab info, it shows "New Tab" instead (you can get back to the tab via the rt click drop down menu option).
I NEED this addon!! lol. Here's to hoping to get a mod for it quickly!? --thanks