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The Mozilla Foundation, the organization behind the Firefox browser, is working on adding a new feature to its browser that is similar to the Site Isolation feature that Google rolled out to Chrome users this year.....
Mozilla starts Project Fission

But Chrome won't be the only browser with Site Isolation. Work on a similar feature also began at Mozilla headquarters back in April, in a plan dubbed Project Fission.

According to Mozilla sources who spoke with Bleeping Computer, this project is still in its early stages. We were told that implementing a per-domain-process architecture is a relatively simple task, especially after Mozilla has already rolled out Electrolysis, a project that split Firefox from a single-process app to a multi-process architecture.
 

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Firefox Fission aims to thwart nasty Spectre-style attacks
With a Firefox effort called Project Fission, Mozilla is moving ahead this month with a plan to keep a major class of computer attacks at bay.

The Spectre and Meltdown attacks, more broadly called side-channel attacks, have been a major issue for the computing industry since they emerged a year ago. Mozilla fixed the immediate security vulnerabilities in Firefox last year, but now with an overhaul called Project Fission, the company hopes to protect the browser from any future Spectre-class variations.

Fission has been underway for months. But Mozilla plans to take its first concrete step later this month with a release called Milestone 1, said Nika Layzell, a Firefox platform engineer, in a blog post Monday.
SOURCE: Project Fission should soon start guarding @firefox against future Spectre-style attacks