Mozilla has blocked Flash on its popular Firefox browser. A message now appears saying that Flash — the plug-in that enables animation, browser games and other graphics online — is vulnerable, along with a message that Mozilla reserves the right to block software that “seriously compromises Firefox security.”

http://www.thestar.com/business/tech_news/2015/07/15/widely-used-flash-player-in-trouble-over-security-problems.html

хром тоже будет блокировать