This Friday, some scary news hit the Internet: some browser add-ons can be spying on you and inserting adds into the pages you visit. How does this happen? The malicious add-on can be bad from the start and hide the data it collects from the user, or the add-on can change hands behind the scenes and get updated with new data collection preferences. Many extensions fall into the latter category, with the original developer being offered a large sum of money from an adware company so that the company can push out a malicious update to unsuspecting users.

For more information, visit the Ars Technica, OMG! Chrome, How-To Geek, and Lifehacker pages concerning this issue.