NoPlugin by Corbin Davenport

NOTE: NoPlugin requires download access to open video and audio files that cannot be played in the browser, and notification access to show download notifications.

NoPlugin is an extension for Chrome, Opera, and Firefox that allows you to play some plugin content in your browser without plugins. All browsers have phrased out the use of web plugins, due to performance and security problems, so NoPlugin was created to maintain some compatibility with outdated sites.

NoPlugin searches webpages for embedded plugin objects, and converts them to HTML5 media objects. If the browser is unable to play the file natively, NoPlugin can still download it to your computer.

NoPlugin is open source under the GPL license. Its code is available here:
https://github.com/corbindavenport/noplugin