adobe-flash-playerMozilla on Monday began blocking all versions of Adobe Flash Player from running automatically in its Firefox browser, reacting to news of even more zero-day vulnerabilities unearthed in a massive document cache pilfered from the Italian Hacking Team surveillance firm.

Computerworld confirmed that the current production versions of Firefox — dubbed v. 39 — on both Windows and OS X now block Flash.

Mozilla engineers swung into action over the weekend after reports surfaced late Friday of another Flash zero-day — the term that describes a flaw for which there is yet no fix, or patch — discovered in the gigabytes of data and documents stolen from the Hacking Team. At the time, the bug was the second in Flash spotted in just five days.

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