To improve the security of a user who is using Mozilla Firefox browser, Mozilla is evaluating different click to play scenarios. These different options will also help in enhancing the user’s computer system performance and battery life.
The click-to-play functionality basically blocks plugins from automatically running on websites when activated. For instance, if you visit the popular video-sharing website YouTube, the videos there won’t start playing automatically anymore since Flash is blocked by click-to-play. The same goes for advertisement banners that are made in Flash, Java games or Microsoft Silverlight videos.
Jared Wein, a software engineer at Mozilla, has created an implementation of click-to-play plugins for Firefox. With enabled click to play plugins, the browser will require that content from plugins like Flash and Java to be clicked by the user to load and run. This feature, which Mozilla also calls as "opt-in activation for plugins" is already accessible in nightly builds of Mozilla Firefox. Wein is further working on the browser to give it the ability to remember click-to-play settings on a site-by-site basis.