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On the right-hand side of the location bar, there's a Page actions menu (the 3 dots) which includes taking a screenshot.

I cannot see it there.

Did screenshots somehow get disabled? In about:config, check the value of the extensions.screenshots.disabled pref.

No it was never disabled. Also, I have tried to disable it and enable it again and restart the browser and similar things...

Weird. Maybe try filing a bug to see if someone who works on that feature has any other ideas.

Are you sure you've updated your browser? I have the option in that menu.

Sure, I have. This feature is there for a long time as of my understanding (since Quantum, maybe?).

I have tried this feature when it was only in test pilot mode, but then I removed it (that was a long time ago). Can this be related?