How to block instant transition to some sites?

Question

safari

It is necessary to make sure that when you go to some sites, they open with some delay. For example, I clicked on the Facebook bookmark - a window opens on which the minute is counting down (as on "bad" file sharing services, such as depositfiles) and only after that it opens up to Facebook itself.
Yes, it is necessary to combat procrastination. More precisely, the fight against the habit of constantly switching to these sites.
No, extensions that block certain sites temporarily or completely are not suitable.

Answer 1

At the entrance to each site you insert a "modal" in the entire width of the screen, on top of everything. Every time it will be very lazy to remove it from the markup.