Perfect

not working properly on firefox quantum ... it logs off every time a restart the browser .. really annoying

Gets confused sometimes

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.