Pin4Ever is a handy and reliable Firefox extension meant to help you create backups of your pins from your Pinterest account.
You can rely on Pin4Ever to restore pins, locate duplicate entries or find the pins previously removed from Pinterest.
Additionally, it integrates dedicated Pinterest functions such as Move, Copy, Delete, Rearrange and Upload, whereas the Pin Anything feature comes in handy when pinning any element on a certain webpage (it captures a user-defined screenshot of the page).
Another function of Pin4Ever is the Scroll to Bottom one, which is especially useful for the long Pinterest pages.
Note: If you want additional features, you can upgrade to a paid account.