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.

No longer works on Firefox. Will not auto-fill any username or password. Icon stuck on yellow.