@mcc@mastodon.social @jk@mastodon.social

This isn't going to help fix your current firefox install, unfortunately, but I've been moving all my browsers to Floorp and Firedragon in part because the rounded look irks me so much. They are basically just Firefox with more customizability options, so you can switch the tabs to the old Photon or Lepton designs. If you prefer LibreWolf, Firedragon has a bunch of the Librewolf settings imported along with Floorp's customizability.