I remember the time when our security team discovered massive amounts of internal documents as images on the net.

A lot of people had used a screen shot browser extension and as we were working in Google Docs a lot of people included document screenshots in presentations.

The extension on the other hand uploaded all screenshots to the web and made them publicly available.

I was glad I didn't use it. It was a nightmare. Since then I use only the built-in tools of the OS or of the Browser (like FF or Chrome has).