On Firefox 55.0.3 (32-Bit) and Windows 10 I've had that problem for a while now: Whenever I enter login-information that I haven't saved yet and the icon turns green (I guess it's to inform me that I could save a new password), Lastpass crashes and I can't expand it anymore, neither in this tab nor in another. All I can do then is restart Firefox. This happens every time. I have uninstalled and re-installed it many times, I tried older Versions, I disabled all my other addons - nothing helped. Is there something else I could try?