Firefox Nightly is being tested

For a long time I've been using Firefox Nightly on the desktop and on my mobile phone. Some time ago I even built it locally when I did browser architecture research, and I almost never saw anything strange except for a couple of crashes. I even forgot that I'm using nightly builds; one benefit instead is that you receive early hands-on experience with new features, or you can complain about poorly developed ones (like WebGPU, for example).

But recently, I realized that I was using a nightly build when I saw the testing label "I'm a temporary text to indicate you're on the new Tab Fragment" on the new tab interface.