Detect password pages

[fregante]

Like https://github.com/sindresorhus/refined-github/blob/2fc61cf1ce9ea8f0d7d4f8cb5e5220ad7faad354/source/features/index.tsx#L87-L91

document.title === 'Confirm password' || document.title === 'Confirm access'

Alternatively it should have "is empty page" that includes both 500 and this password page