Web browsers can't find my certificates on KDE Neon (Ubuntu) 22.04

Operating Systems & Open Source Linux
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I’ve tried the following applications:

  • Firefox (Snap)
  • Vivaldi (DEB)
  • Edge (Flatpak)

I put the root and immediate certificate crt files in /usr/local/share/ca-certificates/, and ran update-ca-certificates, and no dice. I did try to manually import on my Firefox (snap) using the same certificates and that worked.

Edge (Flatpak) on my Rocky Linux 9 works fine when I do update-ca-trust.