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Mozilla has confirmed web-based attack vector for Meltdown and Spectre CPU bugs

“Our internal experiments confirm that it is possible to use similar techniques from Web content to read private information between different origins,” said Luke Wagner, a software engineer with the Mozilla Foundation.

from: https://www.bleepingcomputer.com/news/security/mozilla-confirms-web-based-execution-vector-for-meltdown-and-spectre-attacks/