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.
Have you correctly set your apt preferences? I didn’t have any issues anymore since I’ve done that.
I’m sure that I’ve set the apt preferences according to Mozilla’s article. I’ll have to wait and see until a new update arrives to Firefox.