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New web privacy system prevents your data from leaking to other sites
One of the biggest threats to your online privacy is the mixture of code that you'll find on some websites. It's all too easy for a legit-looking page to hide data-stealing code, or for innocent sites to accidentally expose your info. If Google, Mozilla and researchers have their way, though, you won't have to worry quite so much about where that info is going. Their new COWL (Confinement with Origin Web Labels) system prevents JavaScript from sharing data with outside websites that aren't explicitly approved; even when the data gets the all-clear, it won't necessarily spread anywhere else. In theory, it should be harder for ne'er-do-wells to hijack a page and grab sensitive content without your knowledge, or simply for you to lose control of where that content goes.
