PSA: Jumpcut is the best add-on
One of the handiest things I've ever downloaded is Jumpcut. It extends your clipboard to 40+ items, which are easily accessed from the top of your (Mac only) screen:
I use it A LOT. Like you know when you're filling out an application online, and you're afraid you'll lose everything when it times out on you? That has happened to all of us. You can copy/paste your responses into Word, and copy/paste them back out if you have to... Or you could just use Jumpcut.
Or like when you paste something into a chat window and press Enter before making sure what you pasted was what you wanted, and you forgot that the last thing you copied was actually something embarrassing...? Well, anyway. Jumpcut. There you go.