And still no support for RegExp features from ES2018(!), i.e. named groups [1]. I love FF as much as the next web dev, but sometimes features fall by the wayside, and it takes forever for FF to implement them. For example, it took literally years for FF to implement focusin/focusout events after they were standardized and all other browsers implemented them.

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1362154