This is one of the essential add-ons on any Firefox. At work, I have to use Windows Vista, so I'm stuck with Firefox 52 ESR, but luckily, version 1.4 works wonderfully there! Recently, I noticed it works somewhat better than on the Firefox Quantum at home: I cannot edit password field entries with version 2.0! I know the field names, I know the data there are in them, but they simply don't show up on listing or searching. I wonder if that's a Firefox Quantum limitation (for improving security, that ends up opening a security hole, because I cannot delete those fields' data).