XXX is dangerous because you can’t control what it does in your browser, and its actions could often leave the system exposed to various forms of malware. XXX is less dangerous than Trojans, Spyware, or Ransomware, but it may indirectly “invite” those into your computer. If you care about the security and safety of your system, virtual privacy, and personal data, deleting XXX should be a top priority for you. Apps like it can be very unpredictable with their advertisements, and you can easily end up getting redirected to some harmful phishing page or a malware-distributing site if you let this hijacker stay in your browser. One other problem that must be considered is that XXX is likely extracting data from your browser and using it to show you ads tailored to your (supposed) interests and preferences. The issue here is that such data would eventually likely be sold to unknown third parties - those could be other advertisers, but could also be scammers and hackers, who could then target you.