Verison 4.2.3 not fixed Puntuado con 4 de 5 estrellas
Version 4.2.3 is causing both firefox 21 and firefox 22 to freeze (Not Responding) indefinitely. Didn't go back to any earlier version of firefox.
Still gave it a good rating, as up until this point, it has been good.
I hope you guys get it together, because this was a great add on.
For now I have it disabled. Shame.