SaveMyClips keeps a history of your current Chrome session's clipboard activity. If you accidentally copy over something that you wanted to keep track of, you can revert to your previous clipboard content.
How to use:
The keyboard shortcuts to navigate your clipboard are Alt+O to go backwards, and Alt+P to go forwards. The clipboard content is stored in chronological order of when it was copied.
In order to view every piece of clipboard content from the current Chrome session, click on the browser action icon. This will display text boxes containing everything that was copied in this session, allowing you to reselect any text that you previously had in your clipboard.