You use to be able to mute tabs by clicking the speaker icon but you can no longer do that. It seems this was reported in the Dev and Beta branch but was never fixed before being released.
This is infuriating that it wasn’t fixed. I use this feature 90% of my time using my browser. I now have to wait who knows how long for it to be fixed. Chrome browser pushed the same assine update so i switched to brave. Brave was still on chromium 70 until it updated today with the same issue.
Can I get a freaking break.