I'm not sure what you mean by "grouping". If that feature is already present in the horizontal tabs, then sure - please include that behavior in the vertical tabs as well.As most folks have chimed in, the behavior exhibited in Edge is really good.At ...
Is this even being considered for implementation?I have been with FF (and use nightlies as my daily driver for the past few years - even earlier when they were called alphas, etc)I'm surprised that Mozilla is keeping silent on this much-requested fea...