Ever since Firefox updated it says all my addons are legacy and so I have to get LastPass (among others) all over again. But when I try to add LastPass to firefox .. it says Download failed. Please check your connection. Obviously I am on the net if I can post this .. It is not LastPass' fault necessarily but Firefox as now all addon creators have to go through a process of getting their addons verified so that Firefox is allowed to let them connect. It is some sort of protection with the latest update. This is the information important for LastPass' developer:

The following add-ons have not been verified for use in Firefox. You can find replacements or ask the developer to get them verified. Dev's can read out manual here: https://wiki.mozilla.org/Add-ons/Extension_Signing

The best extension you can ever have on every web browser. I have used the other competing password managers out there in the past but none of them can compare to LastPass. I seriously cannot live without LastPass. It makes my life so much easier not having to remember 1000 different passwords. Thank you LastPass for such an amazing experience.

Edit: There seems to be some sort of bug in this Add-on, where it logs me off automatically. It is very inconvenient to have to log in every time I start up Firefox. It gets fairly annoying as some have mentioned.

LastPass 4.19.0.5
MacBook Pro (15-inch, Mid 2012)
macOS version 10.14.2 Beta (18C48a)
FF: 63.0.3 (64-bit)

Fairly buggy on Firefox under Ubuntu Linux. It seems to work better on Windows 10, OSX (both Firefox) and Android though.
Main issue I have is the pop up when clicking on icon doesn't stay open. I have to right click and sign in from webpage, which is an ok workaround. From there, the pop up seems to stay open and work fine. As long as you're aware of this workaround you should be ok.
Earlier issues I've had with Ebay login seems to be fixed and working now.

Como muchas cosas del universo LastPass, se queda a la mitad, teniendo unas grandes posibilidades... Funciona bastante bien, el baúl es útil y la generación de contraseñas también. No obstante, su funcionamiento y a nivel estético no estan del todo pulidos. Hace falta seguir depurando la app y extensiones...

Very good Single Sign On applications. A point of improvement would be automatic login without asking as an option

Aardig handig, maar noteer de inloggegevens!

Penso che sia molto sicuro e facile da usare