What Is Solid Captcha?
Solid Captcha (solidcaptcha.lm.r.appspot.com) is a dubious website which tries to trick users into accepting its notifications request. Site notifications are messages from websites that appear in the lower right hand corner of the screen on Windows machines, in the top right hand corner of the screen on Macbooks, and on the status bar on Android devices. Solid Captcha site claims that users need to allow its notifications to prove that they are not robots. If a user does allow Solid Captcha notifications, those notifications will begin appearing on his or her screen from time to time with ads, links to shady websites, fake alerts from the OS, and so on.