User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:18.0) Gecko/20100101 Firefox/18.0 Build ID: 20130116073211 Steps to reproduce: 1. Watched an HTML5 video in full screen ( http://www.engadget.com/2013/01/30/blackberry-os-10-review/ ) 2. Chose Full-screen (by right-clicking on video and choosing that) 3. While in fullscreen pressed volume-up on my keyboard Actual results: It exited full-screen view and jumped to the top of the web page (so I couldn't even see the video at all) Expected results: The volume should have gone up, the screen should have shown the volume popup over the video, and it should have remained full screen.