When accessing a profile page and clicking on a post image, an overlay is superimposed over the grayed page to display the post (the page is not refreshed). To discard the post overlay, you have to click on the gray part of the page, outside the post overlay.

While there are shortcuts to navigate posts with ← →, I often find myself trying to close the overlay by pressing the Escape key like on many websites, without success. I would appreciate if pressing Escape could discard the post overlay.