When switching tabs quickly, I often accidentally click the speaker/mute icon instead of the tab itself. This causes one of two annoying outcomes: a paused video on a background tab starts playing unexpectedly (and I miss the beginning), or a tab I'm actively listening to gets muted (and I miss part of the audio).
Please add an option in Firefox settings to make the tab speaker icon non-interactive — acting only as a visual indicator of audio activity, passing click events through to the tab activation/drag behavior underneath. Users who prefer the current behavior (click to mute/unmute) would be able to keep it enabled.
Alternative or complementary approaches that would also solve this: