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.
I used it a few months ago and it was pretty smooth.
I used it decades ago (using the CLI installer for a Sid install I eventually fucked up beyond repair) and it was okay for a slightly tech savvy teenager, even then.
I suspect a lot of these issues are down to hardware compatibility more than anything else.