That's because nowadays the "standards" is "just what chrome does", and the other browsers can only catch up. Witch is easy for edge, opera and the others chrom

That's because nowadays the "standards" is "just what chrome does", and the other browsers can only catch up. Witch is easy for edge, opera and the others chrome-clones, but not straightforward for the rest - aka ff. as other as said this feature was already present in ff only, but then noone picked it up and so it was abandoned