After creating a fresh installation of Ubuntu 24.04, I installed DEB Firefox from APT by following Mozilla’s instructions from here. But I noticed that it was secretly replaced with Snap Firefox. I was able to verify this by checking the About Firefox page. This is the third time I noticed this.
One of the reason I moved to MX Linux, it is Debian based, always latest everything, like 6.12.11 kernel, my FF just got updated to 135.0, and it is no systemd, no flatpak, no snap, everything is DEB, and stable.