Brief Summary
When multiple tabs are playing audio, opening the context menu on one of them only shows 'Mute This Tab'. For consistency it should still show the 'Mute Other Tabs' items.
Image/Video:
For complete reference here is every combination of tab audio context menus I could think of, of which the last two show the issue:
None:
Only Selected Playing:
Only One Non-Selected Playing:
Multiple Non-Selected Playing:
Selected & One Non-Selected Playing:
Selected & Multiple Non-Selected Playing: