I've got also 1Password 4 that's still working nicely between all my current browsers: if I switch to Quantum, I have to switch to 1P6 or Enpass and lose that. It's very likely that I switch back to the latest FF ESR when Chromium drops MacOS 10.11 and Waterfox abandon its pre-Quantum core - as it was the reason I switched from FF to WTF.
