Enable hotkeys for HTML5 playback: video screenshot; enable/disable picture-in-picture; copy cached video; send any video to full screen or browser window size; fast forward, rewind, pause/play, volume, skip to next video, skip to previous or next frame, set playback speed. Video sites supported: YouTube, TED, Youku, QQ.com, bilibili, ixigua, iQiyi, support mainstream video sites in mainland China; Live broadcasts: Twitch, Douyu.com, YY.com, Huya.com. Custom sites can be added
不支持七牛云，大家到更新吧：https://github.com/xinggsf/gm/raw/master/%E8%A7%86%E9%A2%91%E7%AB%99h5.user.js