With the current bugs (constant re-authentication, no copying username/password, no auto-fill) this extension is useless for me. Due to missing Firefox 57 support of this and other addons I have kept Firefox 54 for now with all auto-updating disabled. For all those in the same boat who want to also revert the LP extension back to a working version, here's the link:
https://addons.mozilla.org/en-US/firefox/addon/lastpass-password-manager/versions/

This has been a very useful add-on, and now that LastPass has become a web extension, the incompatibility with FF57 is over. Thanks for that. BUT, the web extension lack the very useful "copy username" and "copy password" features! The user now has to open the Edit page for a website, unhide the password field, and then copy the password. That's not useful at all! Please fix this. ALSO, LastPass doesn't offer to save a newly registered site. The user has to manually save a page in the Vault.

Fixing these could bring back the good old shine to LastPass again!

It just lack the most important features... Just copying a simple password is impossible without opening the edit window, we can't fill password on HTTP basic auth window any more, etc, etc :'(

扱うサイトが多く細かいパスワードを覚えずにすむので重宝しています。

too many problems with lastpass for firefox.

super easy. generate secure passwords, never feel lost with last pass.

very good

Amazing extention, keep coding sir :D

Good

Очень удобное дополнение для любителей интернета с множеством аккаунтов на различных сайтах

This addon do not do nothing!!
Wast of time!

Oh, LastPass. Been a user for about 7 years. If only your extensions weren't so buggy and bloated. But overall, thanks for the years of password management.

Not work properly with Firefox Quantum.
But nice security solution.