Lastpass is great by itself, and works fine on Google Chrome as well. But as of February 05 2018 I am having LOT of problem using this add on on Firefox. It does not connect to lastpass any more (icon still stay grey after entering login info), then I have to re-install the whole lastpass .exe for it to work again for a few days, before to see this issue starts again. Just removing and re-installing the add on on Firefox does not works to fix the problem. Only way to fix it temporary is to re-install the whole .exe each time.