Muter is a firefox extension that helps you mute the entire browser without stop the videos and audios playing when muting.Just download and install this addon.A button will be placed in the addon bar. Click the buttonto mute and click again to cancel muting.
Available translations:
Dutch,Hebrew,Japanese,Polish,French,Spanish,Lithuanian,Serbian,Swedish,German,Finnish
Download and install Muter
https://addons.mozilla.org/en-US/firefox/addon/muter/
