Everyone seems to to directing their frustration at the developer. He has worked without much reward for many years to give you this.

It is Google and Firefox that keep breaking this great add-on. Send your anger to these 2 and thank Mr Kang for still trying to get fixes done though it sometimes takes a few versions to get things right again. Then in a few months Google, Yahoo, etc will break it again.
Personally I would give Mr Kang a 5 stars at all times.