how to access permission notifications settings

https://support.mozilla.org/en-US/kb/push-notifications-firefox#w_how-do-i-revoke-the-notifications-permission-for-a-specific-site Are these as small popups on bottom right corner of Firefox window?. If so then these may just be web push notifications from sites you have allowed to send you notifications. Instead of unful information some may send you junk, spam, fake virus/trojan/antivirus alerts etc. You can revoke/block these sites from sending you notifications.