Limit multiple videos

[Dreamer]

While testing the beta version, I opened multiple tabs with videos and it's quite a mess. Another problem is that playing multiple videos at the same time might cause problems, freezing or even crash.

Another problem is, that when switching between browser>fullscreen>viewer, sometimes the same video is playing twice, but the video position is not the same.

Here are few suggestions how to solve these problems:

- Max. 1 tab with video files
- Stop videos in inactive tabs
- Pause videos in inactive tabs
- Synchronize the same video position in all modes
- Use only one video player

I'm not sure which option is possible to implement, that's why suggested more.

Thanks.