What is 'Click-to-Play' and how to enable it in Chrome, Firefox, Opera, and Internet Explorer [dotTech Explains]

Recently dotTech posted a joke about websites that start to randomly play videos or audios and how every web browser should have a feature to kill such websites. In the comments a dotTechie -- Darcy -- posted about very useful comment about using an addon in Firefox to block Flash video/audio from automatically playing; with

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