Yes! Finally! It also confirms that the binary is installed. Oh, by default, the "Library" folder is hidden from Finder view inside the User folder, so you will have to turn that on under View, Show View Options in Finder.
This is not hard to fix in the installer, which has not been updated since May 2016. Tsk, tsk, LastPass.
I have two OS X laptops running the same version of OS X and Safari. However on one of them there is no copy options proposed by the last pass extension for safari : http://www.picpaste.com/7AT5MYTq.png
I haven't change the extension configuration on any of them.