Greasy Fork is available in English.
線上看圖工具，支援圖片翻轉、旋轉、縮放、彈出大圖、批量儲存
Thanks for report, but how can you know that it's a memory leak and caused by this script?
Maybe you can post the URL of pinterest you found which has a memory leak and report your action. That will be helpful.
Works well mostly, however there is a memory leak on pinterest that occurs occasionally.