This extension DOES NOT WORK ON FIREFOX. Period. It hasn't since February of 2018, and it is getting worse. In addition to a glitch logging in with the master password (clicking on the icon on the toolbar just shows an empty rectangle; you have to log in via their main web page), I am now unable to create new passwords ("invalid response") or perform tasks like exporting my passwords ("json error"). LastPass was bought out by another company and the product has gone downhill. Do what I'm doing and look at other alternatives.