It adds a button to the code snippets on Stack Overflow and other sites.
Go to Stackoverflow, find a code snippet. A 'COPY' button will be added at the top-right corner. If you don't know what Stackoverflow is, you probably don't need this.
Checkout my another Chrome extension - https://chrome.google.com/webstore/detail/web-sequence/kcpganeflmhffnlofpdmcjklmdpbbmef