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