ErnieS
I'm sorry for the confusion about using 1Password in Firefox on the iPhone and iPad. @vellum is correct, our 1Password in the browser web extension is only available for Safari on the iPhone/iPad since only Safari currently supports web extensions on those devices. However you can still fill your login credentials into websites open in Firefox by using Password AutoFill.
If you're interested in trying Safari then you can indeed use 1Password for Safari. 1Password for Safari features greatly improved filling capabilities and offers an experience that is similar to what you're already used to with 1Password for the browser on the desktop.
I hope that helps. 😊