A significant upgrade from version 1, you're now able to create/delete quotations, as well as toggle on/off the stock quotations, and import/export your own as you go.
To use this as a Chrome extension before it's available in the Chrome Web Store, you can extract the contents of this zip archive, go to "chrome://extensions" and toggle "developer mode", select "load unpacked extension" and navigate to the just-extracted file contents -- and you should be good to go!