How To Block Flash Pop-ups With Firefox : Lifehacker

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元ネタはFirefox popups | www.petebevin.comで、

Fortunately, you can get around it:

  1. Type about:config into the Firefox location bar.
  2. Right-click on the page and select New and then Integer.
  3. Name it privacy.popups.disable_from_plugins
  4. Set the value to 2.

The possible values are:

  • 0: Allow all popups from plugins.
  • 1: Allow popups, but limit them to dom.popup_maximum.
  • 2: Block popups from plugins.
  • 3: Block popups from plugins, even on whitelisted sites.

これで、フラッシュベースのポップアップは、スマートにブロックできます。