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.
It’s not as up to date as other rolling releases, unlike stable it doesn’t get security patches right away, it gets frozen for months during the switch from one stable to the next, and in my fairly limited experience it just has more bugs. It’s not bad, but it’s a testing branch. It’s not intended as a daily driver, and it shows.