Onemacusa.com is a very malicious website that periodically may display the great number of its very annoying web push notifications. Onemacusa.com attacks Google Chrome, Mozilla Firefox and other browsers. The website tries to make you click on the “Allow” button in order to start showing its intrusive advertisements in the form of web push notifications. However, clicking on “Allow” immediately hijacks the browser and may forward you to a lot of dubious pages on the web.