Lastpass is ok. If you are missing some features like the Copy Password button, you need to install via the installer from their web site. There is a binary component that is not included when you install from here. See:
https://lastpass.com/support.php?cmd=showfaq&id=826
https://lastpass.com/support.php?cmd=showfaq&id=5576

Works like a charm on Chrome, but alas on Firefox it's pretty much useless. It rarely autofills and when I try to go to my vault through the 'button' it shows a completely unresponsive page without any information, but with the lastpass layout.

Fonctionne très mal, le remplissage automatique ne se fait pas à 100%, les fenêtres qui s'ouvrent pour accéder aux données restent souvent blanches. Dommage.

Extension is completely broken, autofills VERY rarely, can't save new sites manually, and goes to a blank screen when trying to edit locally.

in version 4.9.2.0 the copy password functionality has been remove and it is awful because the autofil function does not always work.

Also, in this version, edit a record from of a website from the page of the website does not work!

When booting Firefox Lastpass doesn't enable without entering the password and ID manually. This computer is a Gateway/w Win 7

The new LP 4.9.2.0 version is working again with Firefox ESR.. good..
but I noticed that with LP active when browsing protected https urls, the browser becomes too slow (almost freezing) and the CPU goes high..

As soon as I disabled LP the logging in and browsing over https urls websites became fast again as it should be..

This time I voted 2 stars,... in the past this was for me a 4-5 stars extension

La conozco de hace años y nunca dio problemas.

使用困难,不方便,我需要的是自动填写密码而不是复杂更加复杂并且无意义的点击操作,It's hard to use, it's inconvenient. What I need is to fill in passwords automatically rather than complex, more complex and pointless clicks.

In the new version 4.9.2.0 the compatibility with FF 56.0.2 was restored again. The menu in the toolbar now works again. Hooray! Thank you very much to the developers!