Always run into the pop-up with error code 268D3 or code B2957e asking you to call for tech support at 1-888-251-3172 while using the browser? This pop-up overlapping your webpage and locking up your screen actually is a tech support scam used to cause distress and make users to contact the swindlers via this 888 line. Nailed by this annoyance, you could be driven insane by the fake security warning displayed and audio alarm triggered. It may tell you something like "your computer has alerted us that it has been infected by a virus" and urge you to call immediately.