Automatic updates are a thing, but not necessarily good as this is the first thing disabled on windows since palladium for security, privacy and usability reasons.
Actually talking of good/bad dichotomy is inappropriate here, automatic updates are a tool that can be useful and comes with benefits and downsides. Firefox automatic updates is among the first things I disable when I install firefox because it caused me more issues than it solved.
Starting firefox to discover it has auto-updated itself and had broken half the extensions you rely on to make the browser usable is not nice, specially when there are no option to undo the update other than removing and reinstalling.
But when the autoupdate installed a new firefox that simply broke audio in the browser and now forces you to install something you've been actively avoiding or that is not available in this specific distro is something else.
I have a working update hygiene I'd rather deal with updates myself, thanks.