The extension works well if you want to just copy passwords onto websites. If you want to edit, delete or otherwise manage your passwords or accounts, its a rougher ride. Edits/deletes will randomly fail to save, usually after a firefox update. I'm unable to modify account settings from the vault. I consistently get an error stating "Your session has expired". There are a variety of UI sizing bugs that tend to crop up and then disappear.

I'm disappointed at the lack of polish creeping in over time, LastPass should put some focus back into making this feel like a reliable, top tier password manager.