If you get ads, popups, notifications from AccessibleSearchGuide, your Mac is infected with adware. AccessibleSearchGuide is adware for Mac.
AccessibleSearchGuide changes setting on your Mac. First, AccessibleSearchGuide installs a browser extension in your browser. Then, after AccessibleSearchGuide 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.