Look at simplifying more feature implementations with the CSS :has() pseudo-class

[insin]

As of Firefox 121 (released 4 months ago), all the main browsers we support support the CSS :has() pseudo-class

Look at existing features which could be simplified by using it instead

e.g. to hide the "Subs" tab (example of a profile which has it), we're currently manually finding the tab and adding a class to it - this could be a single CSS selector with :has() instead

• Hiding Subs tab