I don’t want a PLAY MUTE PAUSE not even a CLOSE button. Especially NOT when they have their own internal state for then they choose to appear and disappear.
I don’t want to pay attention to them, I don’t want to have to look for them, I don’t want them getting in my way any more.
If I want to close a tab, I middle click it ! I already have global mute controls, I don’t need an extra volume control, I don’t have “tabs making unwanted sounds” problem because I have “Go To Sound Tab” addon installed, so I can easily find any tabs that makes sound and mute it correctly, without a extra, unneeded layer of muting (tab muting, versus app muting versus player muting, that is too many muting options, I don’t want to use tab muting personnally so I want these buttons out of here !)
I don’t want to have to rely on running violentmonkey script engine on top of my already sluggish browser when I barely have 6615 open tabs.
I want to disable the feature at the root, inside firefox, not patch up webpages like dark reader does.
AAAAAaaaaaaaaaaaahhhhhh h!!!
And they are back despite the fix

They’re intermittently there because the script is a patch but the underlying functionality has not been disabled.
Sometimes the page will override the script patch, and put unwanted buttons of my tabs,
so I end up closing and muting tabs by accident
EDIT: Also doesn’t work because when a tab is open, userchrome.css does not apply until you actually click on the tab
result