Mozilla this week unveiled a preview of a redesigned, re-engineered Firefox, dubbed "Quantum," making good on its commitment to rejuvenate the browser.

"We're releasing the Beta of a whole new Firefox, one that's powered by a completely reinvented, modernized engine," Nick Nguyen, who leads product development on the browser, said in a Tuesday post to a company blog. Officially designated version 57, the release has also been given the Quantum name, said Nguyen, to "convey the magnitude of the changes" in the browser.

Mozilla has numbered, but never named, its Firefox releases.

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