Brilliant when it works; otherwise, and often, a real pain. Example: something to do with "installing the binary version" that LP can never quite make clear to the thousands of users having similar problems. One of my support requests was answered by their advising me that I would have to enable passwords in FF for LP to remember my password for sign-in. Really? You want me to compromise my entire privacy approach? But is that even the real solution? Nobody knows and nobody seems able to get a clear solution from this company.

Also, a serious security concern when enabled in FF; even when not signed-in, LP is calling home. Best to disable it when not needing it.