writes "Mozilla is developing a feature in Firefox that would require some user interaction in order for Flash ads, Java scripts and other content that uses plugins to play. In addition to easing system slowdowns, the opt-in for Web plugins is expected to reduce threats posed by exploiting security vulnerabilities in plugins, including zero-day attacks.
"Whether you hate them or love them, content accessed through plugins is still a sizable chunk of the web. So much so, that over 99% of internet users have Flash installed on their browser," writes Mozilla's Jared Wein, the lead software engineer on the project, in a blog post."Link to Original Source