Most of the functionality seems broken in Firefox. Chrome plugin is fine (generally works, though UI has some issues) but the Firefox addon seems to have relatively few actually working features. A preview of things that are broken (not exhaustive):
1. Can't unlock accounts that are set to "required password re-prompt"
2. Can't add sites.
3. Can't copy password from addon.
4. Search box isn't default selection for typing when opening the addon.
5. ctrl-c in generate password box doesn't copy the password, it just appends the letter C to the text field. You have to right-click copy.

Have been using lastpass for years, and their addon is solid.

Cannot copy password without reveling it.
In general, there is limited option in UI panel comparing to previous non web-extentioned addon.

Not good at all, but better than the rest of the pack.

These steps fixed all the issues I had around not being able to copy username/password without exposing it:

https://lastpass.com/support.php?cmd=showfaq&id=5576&sf84457645=1

Why you you have to jump through these hoops to get full functionality is beyond me (hence 3 stars because this UX just sucks).

Otherwise, it works fine I guess.

C'mon guys! I have latest version of FF and LP beta for FF. I have cleared the cache. This is what I'm getting:

Not recognising new sites, having to type in credentials manually
Copy not working
Password generator not working
Auto-fill not working on some sites, notably Paypal

This is making it very difficult to use

I'm not interested in the technicalities, I just want it to work like it used to! I've used FF and LP for a long time, but if this isn't resolved soon, I will stop using both.

Plugin has not worked for weeks... After entering my credentials (user/pass) I almost always get a blank white page... occasionally I get the prompt for my two factor token, but even when I enter it, it doesn't work and I end up in a constant loop being prompted for it again and again. I have tried disabling/re-enabling and removing/reinstalling the addon, and clearing FF cache, but it is still not working.

Great for when I can't remember my pass word

last update broke all functionality. cannot log in

As others mentioned, the copy function is missing. Moreover, two step authentication refuses to remember my logon for 30 days, forcing me to send a code to my phone with every single logon. Neither of these problems exist on Chrome.

Seit Firefox Quantum kann man sich nicht mehr anmelden. Ich bezahle für diese App! Da kann es nicht sein das solch ein Fehler ewig nicht gefixt wird.

D

Can't log in on any of my devices with this. It made me uninstall Firefox on all my devices thank you

Copy password and Copy username were suddenly removed from the version for Firefox/Linux without notice.

Without them, this extension is of much more limited use than advertised.

fantastica!! mejoro mucho, guarda todo con un solo click.

Extension does not generate passwords in Firefox Quantum.