Dear Mozilla Community I have a Lenovo Yoga Book laptop-tablet, hybrid computer with Android. Everything works well, but in my old laptop with Windows and Linux Ubuntu, I could watch and listen to one video and listen to another video, that is hidden (opened on a diffrent page). Unfotunately I can't do that on Android. Strange thing is, that I can listen to the video, that is hidden (opened on a diffrent page) but only, when I turn off the sound of the video I am watching watch. The other strange thing is that one I was able to to watch and listen to a video and listen to the sound of another video, opened on diffrent page. So, it looks like, this is technically possible. I tried Android settings (including desktop options settings,) and my browsers settings, but nothing works. However, I might have missed something. I need to watch and listen to a video, and listen to another one, with music at the same time; it helps me in the learning of a language. Maybe you know, some good software app or browsers, that can solve this problem? Currently, I use FireFox Beta, FireFox and Chrome browsers. I have also a question about subtitles, is there any app or browser that can offer good translation, when a video on youtube, does not have translation options? Could you also tell me please, what may be a reason, that I watched a youtube video, that had translation option and now, this video doesn't have any translation option? Is there any way to solve this problem? Thank you very much for helping me.