I lost some of the fields that I added for secret question/answer pair. Whenever I needed to read the fields I had to switch to edit mode which is not the right thing to do. I always felt I was a click away from wiping out sensitive data which might be how I lost the secret question/answer. The UI is clunky an not intuitive. It's cluttered for no reason and you have to use templates that work for narrow use cases and ignore all the other stuff that you need to save for credentials like the aforementioned secret question/answer and other credentials that the account may require of a user. I'm exporting all my data from it and using something that doesn't wipe out credentials when I need them the most.

Worked great until it didn't.
This extension was super helpful but suddenly it started to prevent my browser from loading whenever it's installed.

Lastpass est un bon gestionnaire de mot de passe, mais l'extension pour Firefox fonctionne très mal : beaucoup de lenteurs et pas toujours optimal pour le remplissage des champs !

Log in in browser always states unexplained error.

LastPass is one of the best credential managers, but currently incompatible with the 'Ublock Origin' and 'Decentraleyes' addons. LastPass will deny your signin attempt with these add-ons enabled. LastPass essentially becomes unusable even with the "Lastpass.com" domains whitelisted under on the Ublock and Decentraleyes settings. There is currently no fix for this bug other than disabling Ublock and Decentraleyes which is concerning to me, and can be considered a security risk for others.

A good password manager but the ADD-ON is constantly having issues with Firefox.

I love LastPass but this extension keeps freezing Firefox entirely. I couldn't find any solution to this. Its driving me crazy!

I'm so tired of LastPass slowing down my browsers. I almost always have to turn it off. The browsers usually but not always prompt that LastPass is slowing them down and asks to close it. When LastPass is on, pages take forever to load most of the time (if they get that far), browser functionality stops, and I can't do anything on my PC except hit the power button and harm my drives. I have 8gb of SDRAM on several PCs, both Windows and Linux. The same problem occurs on all systems for Chrome and Firefox, which are the two I use. I don't have any problems when using Trend Micro Password Manager.

Apparently they consider Firefox a second class browser - the extension has numerous pretty essential bugs that are not being fixed for ages: copying password from the menu broke years ago, password database export doesn't work, on Firefox for android you can't even log in anymore, etc.

Used to be good but each new version gets slower and now I can't even copy passwords from secure notes in the dropdown menu.

Where the heck did form fills go? The latest update has completely removed them!