Mozilla is experimenting with a new feature for Firefox that’s intended to improve security by isolating each site’s content within its own sandbox. As ZDNet explains, site isolation was first deployed in Chrome back in 2018, but has only now become available for testing in Firefox.

So why is site isolation important? In theory, websites shouldn’t be able to access data from one another, but bugs happen, and it’s possible that a malicious site could use a security vulnerability to access sensitive data from another site open at the same time.



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