NSFW is just another undefined concept. It depends on your work, on your culture/upbringing and the society you live in. If I stumble upon pictures of tits bec

NSFW is just another undefined concept. It depends on your work, on your culture/upbringing and the society you live in. If I stumble upon pictures of tits because someone posted a link to a yellow press newspaper site or a random celebrity scandal, I .. misclicked because that wouldn't interest me in the slightest. But it wouldn't be unsafe, not even for work. On the other hand, I wouldn't exactly want to end up on a nazi propaganda page (even if I'm merely looking at current splitter groups/facts around news reports about these sort of braindead idiots). I would feel very bad about leaving a trace like that - even if I don't think I'd have to face any sort of consequences. Point being: Safe™ is undefined, for minors or employers. You can try to find a GCD, a common global set - and you'll fail/end up with a balance act between false positives and misses.