Copying on mobile is difficult

On Firefox, on my Samsung Galaxy S8, I find it difficult to quickly and easily copy passwords. I cannot "Select All" on a single password; It treats the whole website as a single paragraph. Is there any way you can put a "copy" link on each password to let a user easily tap to copy on mobile?

I'm considering looking into this myself for educational purposes, so assign this issue to me if it doesn't take literally 2 minutes.