What Chrome does is maybe they have the support or staff to support such features for a paid corporations to invest in such options. And being Firefox is small organization that would require more investments they they have unpaid team staffing to do. Not all Browser are equal here. For such options you can always looking online if there is 3rd party software or Addons that do that as well. Comparing Browsers outside of what each does in comparisons isn't equal or fair for Chrome or Firefox they have different competing narratives here.