You don't need a plug-in for this, do you? Always watch videos with QQ browser. Support online viewing and direct playback without transcoding. If you use it to open a web page and watch videos, you can set the screen switching mode in the browser settings in advance to follow the rotation of the system, and then when watching videos, as long as the full screen is horizontal, or as long as the mobile phone is lying down, it is horizontal. And it has a special video center, which can be found without opening a webpage.