An unwanted adult-site alert on a shared screen can be alarming, especially when no related tab is open. First identify whether it is a browser notification, a pop-up window or a message from an installed app. Those have different controls. You do not need to click the alert or revisit the advertised page to remove a browser permission.
Your quick checklist
- Read the sending browser and website shown on the alert.
- Open browser settings independently.
- Block the specific notification permission or pop-up allowance.
- Check installed software separately if the behaviour continues.
In this guide
Step 01
Identify what is sending the message
Firefox explains that a website with notification permission can send alerts while the browser is open even when that website is not loaded. A closed tab therefore does not establish that an alert came from an installed virus. A notification’s frightening claim is also not a security scan.
Write down the browser name and sending domain shown by the system, without opening the advertised destination. Keep a private screenshot only if you need it for support. Avoid posting a screenshot that exposes other notifications or account details.
Step 02
Remove a Chrome notification permission
In desktop Chrome, open Settings, then Privacy and security, Site Settings and Notifications. Find the unwanted site in the allowed list and block its permission. Chrome’s official instructions also explain how to block a site by entering its address. Check the browser profile you were actually using.
Blocking notifications is separate from deleting a history entry. If several people share a computer, changing a setting in your own profile may not affect permissions saved in someone else’s profile. Ask the person who controls that profile to review it; do not edit another person’s account without permission.
Step 03
Review Firefox permissions and pop-up settings
Firefox provides notification controls in Settings under Privacy & Security, in the Permissions section. Open the notification settings and remove or block the unwanted permission, then save the change. Mozilla’s linked guide explains the available controls.
A pop-up is a separate browser window or tab. In Chrome, review Site Settings, then Pop-ups and redirects, and block an unwanted entry in the allowed list. Do not disable all browser security controls because a pop-up tells you that a special player or update is required.
Step 04
Check whether the symptom actually stopped
Close the unwanted window using the browser or operating system controls. Continue with an ordinary browsing session and note whether another alert appears, which browser sent it and the sending domain. If the domain changes, inspect that permission instead of assuming the first change failed.
If new tabs, unfamiliar extensions or changed browser settings persist, follow the browser’s unwanted-software guidance. Our separate app-and-extension guide addresses removal. Keep these checks distinct: a blocked notification does not remove software, cancel an account or erase information held by a website.
Remove the permission at its source and verify the result. Treat persistent software changes as a separate issue, rather than repeatedly clicking the alerts that caused concern.
Common questions
Will clearing history stop browser notifications?
Do not rely on it. Review and block the notification permission directly.
Does a notification prove my device is infected?
No. Websites can send permitted notifications. Persistent unwanted software or account activity still deserves a separate check.
Sources and scope
Based on current desktop Chrome and Firefox support instructions. Menu names can differ by operating system or browser release. Notification removal is not a malware diagnosis.