Browser extensions can be just as dangerous as regular apps, and their integration with the tool everyone's constantly using can make them seem erroneously innocuous. Case in point: a collection of more than 200 extensions for Chrome and other major browsers are being used to "scrape" website content. This essentially turns browser users into a free data center, with capacity sold off for profit. The Secure Annex report (spotted by Ars Technica) is an interesting one, documenting the MellowTel system. Here's how it works: Step one, a developer of a legitimate extension is offered a tool that integrates a software library into the extension.