I do not have sufficient profanity in my verbal arsenal for websites that override basic, fundamental browser behaviour because they think they know better than I do what I actually meant to do. I have noticed Medium being a regular perpetrator of this sort of broken behaviour before. That one of the developers at Medium could run into such a glowing example of one of the many reasons it's nasty to override browser b…
I'm not sure if it's happening now, but at one point in time F5 wouldn't work to reload the page if twitter is loaded. And not to mention google plus, that swallows Ctrl+PgDown and Ctrl+PgUp, which happen to be shortcuts to move through tabs. So you are moving through tabs, then you suddenly stop, and you have to reach for the mouse.
But what's really silly is that the browser actually allows a webpage to override such a basic shortcut like F5.