Does not work well with websites that use Web Components polyfill, for example https://polymer-project.org/ or https://cloudstitch.com/.

I reported this to LastPass more than 2 months ago and it is still not fixed.

LastPass is always great, but the Add-On for Quantum really sucks.
It forgets the mail, and it happens that, even though I'm logged in, it does not load my accounts (list completely empty)

This plugin lacks a couple key features compared to other browser versions. The most important one being the ability to copy a password or user name without having to open the full application and "un-hide" the password.

Mozilla Quantum really broke this extension. Features aren't at parity with Google Chrome. It's just gotten worse and worse. Every time I try to use this it breaks now.

After months still does not work on Android

Not working well with Firefox Quantum. Far better with Chrome. I also have weird conflicts between Lastpass and eBay. Lastpass is causing the page refresh on eBay to hang. As soon as I logout of Lastpass, eBay then refreshes with no problem. That said, I was always a big fan of Lastpass, but I find it buggy anymore.

Cool

Best Password Manager for any device.

Generally a good app, but needs updates to work best with Firefox Quantum. I miss the ability to manually copy-paste usernames and passwords on sites where the app can't recognize the login fields correctly.

Only works on about half the sites I visit.

Cannot sign into Lastpass at all.

I love lastpass but for several weeks now the addon will never probably work in firefox android. When you go to click on a login field lastpass asks you to login, but after you do it never completes or logs you into the app, it just hangs there with the busy swirling wheel indefinitely.