Before switching to Proton Pass, I used Bitwarden, and it was extraordinarily rare to find a login form that it couldn't autofill (and on the rare occasions it did happen, it seemed like the site itself was actively preventing autofill). But with Proton Pass, it feels as if around a quarter to a third of forms I try cannot be autofilled -- the Proton Pass button doesn't appear inside the input. The reason for this isn't clear; all of these forms have looked standard, and the input elements seemed to have the expected attributes.

This lack of autofill support for certain sites is far and away the biggest problem with Proton Pass for me, and it would massively improve my experience if Proton Pass could be improved in this area.

Below are the sites I have most recently noticed Proton Pass cannot autofill. I will update this post as I discover more.

Sites where autofill doesn't work:

https://www.gog.com
https://archive.org

To identify sites where Proton Pass has issues, it would be useful if the browser extension included “report site” feature where users can submit reports for sites where autofill doesn't work or where another issue has occurred. This would make it easier to gather data and fill in the gaps in autofill support.