I really do not like giving bad reviews but... Rated 1 out of 5 stars

Ok, I downloaded it to test it out and never really got a chance to see how it really works because I am working close to 100 hour weeks as it is and I can only do so many things in a day. Next thing I know I get a notice that TB5 is out and I DL it. Then it claims that about half my add-ons are incompatible- including Lighting! I tried and tried and most would not work. I also hated the UI of TB5 so I rolled back to 3.11. Besides, how the heck can they go straight from 3.11 to 5? I then reinstalled my add-ons and got them all working again- except Lightning. A few days later I see a Mozilla page touting how wonderful TB5 is and you can run Lightning on it! Are they freaking kidding? They just disabled the #*&^@ thing! Ugghhhh! I then took a day and went through the entire TB add-on catalog and tested tons of them out and found a few real winners. It also became very clear that most of the catalog has been abandoned and most have not been updated in years. That is going to be a real issue for TB users. Anyways, to make a long story short Lightning no longer would work with 3.11 and for the sake of experimenting I temporarily went to 5 again- and AGAIN Lightning wouldn't work! so it wont work on 3.11, it wont work on 5... Then why is it here??? Now maybe after a million installs and secret hidden version numbers it might take but lets face it: I am a hardcore techie and some of us might be able to do that but what about the common user? if only a tiny% of people can even get something to install correctly the first time that is catastrophic failure! The common user is not going to spend hours doing battle with things to make them work. They simply will walk away and never use it again... I do not know if the developers of Lightning have anything to do with the development of TB itself but just like with Firefox the new versions are proving to be outright failures! Someone at Mozilla needs to slow down this rapid release nonsense and make sure that their new products actually work! Who cares if the car is brand new if you take it out of the driveway and the wheels fall off...

This review is for a previous version of the add-on (1.0b5).