Hello

If you wish to try userChrome.css https://connect.mozilla.org/t5/discussions/help-the-mute-button/m-p/89655/highlight/true#M34698 Then to complement browser.tabs.tabMinWidth https://connect.mozilla.org/t5/discussions/stop-changing-the-size-of-the-tab-when-audio-plays/m-p/92206/highlight/true#M35838

One option would be to use the "List All Tabs" button after the "+" button at the right end of the tab bar. If a tab is playing audio in the current window, there should be a speaker icon for it on this drop-down list. Does that work on yours?

Hello

Clarification Since the release of https://www.mozilla.org/en-US/firefox/131.0.3/releasenotes Fixed an issue where the "List all tabs" button was not able to be moved from the toolbar https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars

That's the reason you can't see my "List all tabs" button .

Does that work on yours?

Yes it works