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.
And pin other repos so Ubuntu doesn’t replace it. And change the apt.conf rules that alias out apt install commands for the snap install equivalent. And whatever the countermeasure is for the next sneaky ploy they put into action.