Most browsers allow users to mute the audio playing in one of the browser's tabs:
Google Chrome displays a little speaker icon on any browser tab that is currently playing audio. To mute the audio for a tab, right-click the tab and choose Mute site
Microsoft Edge. Simply click the audio icon or right-click the tab to choose Mute from the drop down menu.
Safari. Click the Audio button in the Smart Search field.
Firefox displays a speaker icon on the tab making noise, and you can click it to mute the audio of that tab without switching to it. You can also right-click the tab and choose Mute Tab.
Check this article for more details.