I've recently encountered a problem that apparently appeared in the past for other users but not for me. It happens in youtube and not always. Back button plays the same video instead of previous one. (Most but not all) steps to repro: 1. Open a video on youtube. 2. Play some of it then go to another video on that page. 3. Play a bit then depress browser back button. Expected outcome: A. Browser displays previous address of video in the address bar. B. Browser displays the page (video) corresponding to previous address. Actual outcome: A. Browser displays previous address of video in the address bar. B. Browser displays the same page (video), i.e. of current address. C. The "history" stack in the back button is updated as if it had worked.