Proton Pass seems really good so far. It appears to auto-fill everything for me that I have saved. I haven’t caught anything that it didn’t auto-fill for me yet. Yes, proton allows you to generate aliases via the dashboard, or you can use an extension called SimpleLogin that will allow you to do it as well and acts very similar to auto-fill as it will have an icon in an email address box that you can click to generate an alias. I use SimpleLogin all the time.