Sad news: LastPass is now a bad extension Rated 1 out of 5 stars
From FF 55 update arising , LP doesn't work properly. The toolbar button is out of order, the contextual menu is still working in some cases only. No visibility to a new operational release neither for current FF 55 release nor future 57 one with Web extension standard constraint. FF users are clearly not the priority of LP may be for unspecified reasons as Chrome extension works well. This causes many inconveniences to a normal and daily use of LP. If the data management is done with the same improvisation, users can seriously question another solution.