Greasy Fork is available in English.
オンラインで画像を強力に閲覧できるツール。ポップアップ表示、拡大・縮小、回転、一括保存などの機能を自動で実行できます
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.