Mute sites by default per abba23

This addon protects you from sites that automatically play loud or annoying sounds by muting all sites that aren't specified in the whitelist.
Muting or unmuting a site will update the whitelist accordingly. This behavior can be disabled on the preferences page if you often want to mute/unmute sites temporarily.

When manually adding sites to the whitelist, you can use * as a wildcard character. *.reddit.com matches all of Reddit's subdomains and www.google.* matches Google for arbitrary top-level domains for example.

In order to mute/unmute a site you can

• click the speaker symbol on the tab
• right-click the tab and select 'Mute Tab'/'Unmute Tab'
• press ctrl+M while you're on the tab
• edit the whitelist on the addon's preferences page