AutoMuter от Webscratcher

AutoMuter automatically mutes every new tab. No more surprise audio from autoplaying videos.

For tabs you've already unmuted

Choose what happens when a tab changes:
- Always: Re-mute on any change (reload, new page)
- On URL Change: Only re-mute when navigating to a different page
- Never: Once unmuted, it stays unmuted

For new tabs

• Always: Mute every new tab
• Exclusion List: Mute new tabs unless their URL matches an entry on your list

Exclusion List

Add sites you don't want auto-muted.
Adding for example youtube.com, makes it match any URL containing it.
Each entry can be edited or removed, and there's a button to add the current page's domain with one click. Changes take effect on all open tabs immediately.