If you are getting notifications from ExtendedRotator, then your Mac is infected with adware. ExtendedRotator is adware for Mac.
ExtendedRotator changes setting in your Mac. First, ExtendedRotator installs a browser extension in your browser. Then, after ExtendedRotator hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.