如何在PC上旋轉youtube影片

如何在PC上旋轉youtube影片:
How to rotate youtube videos on PC:

1.首先安裝Tampermonkey (First install Tampermonkey) 
https://tinyurl.com/n23yerc

2. 安裝 install YouTube Rotate 90°
https://greasyfork.org/en/scripts/375568-%E6%B2%B9%E7%AE%A1%E8%A7%86%E9%A2%91%E6%97%8B%E8%BD%AC

3. 按下按鈕旋轉影片 (Press the button to rotate the video)