Chrome: In the newest version of Chrome, Google changed the backspace key's behaviour so it no longer works as a keyboard shortcut to go back a page. Go Back with Backspace is a Google developed extension that brings that behaviour back. Go Back with Backspace does exactly what you'd expect. Once the extension is installed, the backspace key will once again send you back to the previous page. If you were bummed that this feature was removed in the latest Chrome update, now's your time to get it back.
Go Back with Backspace [Chrome Web Store]