1password is great, but this extension - omg.
This is true for all extensions actually, including mobile.
It will just assume that you want to use 1password for everyfield: name? age? postcode? etc... the 1password autocomplete will hijack, hide buttons, misbehave when arrows are being pressed for the default/browser values, etc...
It's the most annoying thing - you have to chose: have a good password completion experience and a terrible for everything else form related? Or the inverse?