How to disable Adobe Flash in FireFox, Google Chrome, Safari and Internet Explorer

Adobe Flash is a nice product and essential tool to surf the web. However, it have big security issues recently. Many security experts recommend not install it. I cannot get rid of Adobe Flash since sometime I need it. So, I make a change to browser to enable them on demand.

Firefox: Type "about:addons" on address bar or Ctrl-Shift-A to manage Add-ons and set "Shockwave Flash to "Ask to Activate"

Google Chrome: Type "chrome://plugins/" on address bar

Safari: Go to References -> Security -> Click on "Plug-in Settings..." next to "Internet Plug-in" check box.

Internet Explorer: Internet Options -> Program -> "Manage Add-on" button