Support sites with login or with age gate

[firecodergithub]

As an extra feature I think it would be beneficial if this supported sites that block first page with age gate or that have login (and most of the content is after login only)

[tdwright]

I can see why that would be useful, but I'm not sure how we'd be able to write a general solution for this. Surely all the logins / age-gates will have their own form that we'd need to complete? What did you have in mind?