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WARNING! Adobe Flash Security Issue
After latest Flash update (27.0.0.130), deleting Firefox cookies affects/resets Flash Global Settings (Control Panel->Flash Player 32bit), without warning.
That means, if you had those settings to "Block...", after cookies deletion, you're going to see its default settings again (Allow.../Ask...).
Also, deleting Internet Explorer cookies causes exactly the same issue even if Flash plugin has not been installed.
Issue for IE 11 exists before latest Flash update.
Edge cookies deletion does not affect Flash Global Settings.
Adobe promised that issue will be fixed on next update.