I bet I'd love using this extenstion if the popup was usable. Got around the initial login step when first using the extension after installation by tabbing my way to the login form. After that, creating a new card and using a saved source is annoying to work with. The experience is not worth the frustration.

I'll consider reinstalling and using this extension when Privacy decides to work on making it possible for users to actually interact with the forms it presents.

In the meantime, I'll stick with using their website or copying and pasting from my iPhone and iPad.