Go to Settings > Cookies and site permissions > Notifications and remove the domain from the "Allow" list. Step 2: Clean Browser Extensions and Settings
The most common way this domain operates is through push notifications. You must manually block it in your browser settings. syndication,realsrv,com
Check your list of installed extensions and remove anything you don't recognize, especially those installed around the time the pop-ups started. Go to Settings > Cookies and site permissions
Reset your browser to its default settings if the home page or search engine remains changed. Check your list of installed extensions and remove
Realsrv is often bundled with free software or "freeware" downloads.
Never click "Allow" on sites that claim you need to enable notifications to view a video or prove you aren't a robot.
When installing new software, always choose "Custom" or "Advanced" installation to deselect bundled adware.