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Microsoft said it would decide whether to rush out a security patch ahead of its planned monthly security update in August.
Meanwhile, Firefox, the open-source browser, has been updated for the second time in just over a week to fix flaws.
Version 1.0.6 of Firefox has been released by The Mozilla Foundation, which discovered that version 1.0.5 broke important application extensions, including e-mail encryption options.
There have now been more flaws in the Firefox browser this year than in Microsoft's Internet Explorer.