@icedquinn @nytpu @mjdxp @newt @wolf480pl Chrome does it for a while on X11 already, using title bar space as tab bar. I hate it (and turned it off).

Adding extra icons for e.g. sound muting is nice though, but that should IMHO be drawn by the compositor and be requested declaratively by the application (or even not requested at all, but the app should request sound access and that should auto add the icon).