WOW! There are still sites that forbid right click. WOW! I thought that practice was gone in 2007 or so. 500px.com is one of them. But I do want to save some of the photos and look at them again and again.
There is a simple fix. Go to options » Personal Data » Content Settings and put these two rules in the Javascript Exceptions box. And that .js that forbids right-click will not load.
Flick does it too… only God knows why.