腳本為 YouTube 提供一系的增強功能，包括：1）優化的影片詳細頁面佈局，2）免費影片下載，3）影片截圖，4）深色/淺色主題切換，5）影片快轉，還有其他功能。
< 腳本YouTube 增強器™：新佈局、視頻下載器及更多功能的回應
when script is running can't save video preview disabled it's come back enabled again after restart the browser
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when script is running can't save video preview disabled it's come back enabled again after restart the browser