I installed the app for the extension yesterday and it didn't seem to help so I uninstalled it. Wasn't sure I did the right thing since I never saw the app with 1Password7 and didn't even know what an extension was. Anyway, I installed again today per your recommendation, it's listed in the extensions, and it autofills maybe one out of ten times. I read the reviews on the app and there are a lot of 1 stars. I agree with them that it just doesn't work consistently whereas 1Password7 was a no-brainer. I upgraded to 1Password8 last week and had no problems with autofill until yesterday. It might have started when 1Password for a website talked about two-factor authentication, and I may have pressed the wrong button. Whatever, I'll keep trying and hope you'll keep providing suggestions. Safari is my default browser and I want to keep it that way but if 1Password8 doesn't provide a fix over the next few weeks, I'll probably switch to a different password manager.
Also, I don't like the "Always Allow on Every Website" especially after reading the caution associated with it after I select it.