There doesn't appear to be any malware lurking behind the code, and you should be fine once you restart your browser or device. However, there are concerns that someone could use the crash to compromise your security (some attacks rely on crashes to open vulnerabilities)... or at least, use a URL shortener to hide the link and pull a prank. We've reached out to Apple for its take on the situation, and we'll let you know if it has a response. In the meantime, you'll probably want to avoid visiting any obscured links from people you don't trust.

crashsafari working on Android and PC — Fake Jailbreak (@hatefakejb) January 25, 2016