Mag post lang me paano sila iharden. As for this one "Kasi yung recommended mo na browsers ay already tweked na eh kaya secure yung judgement mo. Kung meron man gagawin kaontin nalang." just clarification kasi most people think sa settings lang focus, enable/disable and so forth. Pero actually it's paano rin na build yung browser.
Example Librewolf. Galing sa Firefox, hindi lang settings and na change kung hindi marami rin code ang nawala at naging static (d na magalaw) para secure talaga at walang mistake.