adw-colors VS gnome-shell-extension-mpris-indicator-button

You can also change the minimize and maximize icons to look like macos by copying the button related css that you can obtain from here into your gtk.css

Check this: adw-colors

You can either manually configure XDG_CONFIG_HOMe/gtk3.0 && gtk4.0 check this

You may check this one here. It will let you customize the Libadwaita stylesheet.

You can modify the named colours, there are some examples here: https://github.com/lassekongo83/adw-colors

More info here: https://github.com/lassekongo83/adw-colors/blob/main/HOWTO.md

After you have that, follow this guide to change the entirety of gtk to that accent colour. (including libadwaita) https://github.com/lassekongo83/adw-colors/blob/main/HOWTO.md

Mpris Indicator Button is pretty cool too, but seems to lack a hot key to display it.

I also use the mpris indicator extension myself and that particular dev uses Fedora (or sometimes Ubuntu), and they've said in the past they can't update the extension until Gnome 43 hits, so since Fedora is still delayed to mid-November, that extension won't be officially updated just yet. But if you check their GitHub they have a "crude" master update for Gnome 43 you can use if you really want to, but just know it's not release ready yet.

Extensions: Blur my Shell, Tray icons Reloaded, Clipboard indicator, GSconnect, MPRIS Indicator Button, Night Theme Switcher, Color Picker

There are at least two extensions which do that (for Gnome 40): MPRIS Indicator Button and Media Controls.

Since Waterfox is based on Firefox and the MPRIS implementation of the latter seems optimal I suppose something is "missing"(?) in Waterfox sourcecode, I use the "MPRIS Indicator Button" GNOME shell extension and it's always worked flawlessly with Firefox but it never did with Waterfox .