Arc Fill — one-time setup (~15 seconds)

Puts one button on your bookmarks bar. After that, filling a Guidepoint form is one click, and it can never silently stop working the way the extension did.

1Show the bookmarks bar if it is hidden: press Cmd Shift B.
2Drag the green button up onto your bookmarks bar (drag it, do not click it here):

Arc Fill
Clicking it on this page does nothing on purpose. It only works on a Guidepoint form.
3Done. From now on: open a form from your queue, then click Arc Fill on the bookmarks bar. It fills instantly.