Firefox devs testing feature to find and nuke noisy tabs

One of my favorite features in Google Chrome is the noisy tab indicator and the early trial feature that mutes noisy tabs with one click. Now, that same feature is coming to Mozilla Firefox--or at least we hope it is. Mozilla developers are actively testing and designing a noisy indicator that appears on a tab when audio is playing. Whether the noisy tab indicator will actually make it to the mainstream version of Firefox is unclear. But I was able to grab an early test build of Firefox to see h...