I use the browser extension all the time (Chrome).

When it works, it works great. You can tell the extension to auto-fill and auto-submit, so that it feels like you had been logged in from the very beginning.

The problem is, it works (in my experience) around 80% of the time. I'm guessing it's not on them since it requieres websites to follow certain standards in order to have autodetectable login form fields, but it's a pain nonetheless.

Try it, it takes a couple mins to set up. The best feature IMO is the keyboard shortcuts to fill in details.