Greetings!
Dear voswouter87,
If the mute function for tabs in Opera is not working, here are some quick troubleshooting steps:
Update Opera.
Restart Opera.
Clear your browser cache.
Disable extensions.
Test it in a new profile.
Check for conflicting software.
Contact Opera Support for further assistance.
These steps can help resolve the issue with tab muting in Opera.
If the problem persists, reach out to Opera Support with specific details for more targeted solutions.