I have been receiving (more than a dozen daily) spam notifications (links to advertising) from a site from which I downloaded music (1337x.com). You must allow it to open a pop-up window and allow notifications for the music to DL. The pop-up window opens in a new tab the 1st time you click the 'DL' link. If you revert to the original tab and click 'DL' again, you begin DLing. The pop-up tab contains ads, and again prompts to allow notifications. I stupidly clicked 'allow'' on the prompt from the pop-up. I need to undo that action.