Or, better yet... just leave the website and don't return. Whatever website it is, there are 1000+ alternatives.
Real LPT here : when there's a pop up that blocks the web site, right click on it, choose examine the element. It opens the web console, don't freak out and just press delete to erase the pre-selected line which is the HTML code for this pop up.
If the pop up is gone but you still can't scroll, there's often a grey or transparent page over the one you wanna look. Then just click anywhere on the page and repeat.
EDIT: For people who like this kind if stuff, as others have mentionnés it under this, there might also be a CSS option in the body div which disable scrolling called overflow which you can set as overflow: auto; (instead of overflow: hidden;)
Safari's built-in "Reader" function does wonders for sites like this.
You could also check out archive.is copy and paste the url and boom you get the article. Had to that with a WSJ article that was hidden behind a paywall. Or maybe this is an LPT for paywalls.
You can also use this to [download Adobe cs2](https://helpx.adobe.com/creative-suite/kb/cs2-product-downloads.html?promoid=19SCDRQK) without signing in.
Use GreaseMonkey script called Anti-Adblock Killer: