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Extensions 
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Moonsift - Universal Save Button
Save products from any store in the world. Curate and share your own shoppable collections, gift registries, and wish lists.
Cute Save Button
Little button to save images and webms in one click or with any hot'key's. Praise cute!
Careerscore: Job Search Save Button
Manage your job search in one place – discover and save jobs from across the web
Pinboard.in 'Save a Bookmark' button
A simple button that shows the Pinboard.in 'Save a Bookmark' page and supports bookmark descriptions based on selection.