Like most browsers, Google Chrome can give you the possibility of muting and unmuting a tab where a website is opened.
Important: if you are in a mashme session and you are unable to hear the other participants, please make sure that the Chrome tab of the session is unmuted.
To mute the tab:
Right-click on the tab that you want to mute and choose the option "Mute site"
Once the tab is muted, the address bar should show a muted speaker icon
To unmute tab:
Right-click on the tab that you want to unmute and choose the option "Unmute site"
Important: even if the tab is unmuted, the muted speaker icon might still remain in the address bar.