That's beyond Firefox browser user help, Firefox has a simple adblocker but anything beyond that is Addon or 3rd party install to do what your asking.

''<p>spiegela [[#question-1497153|said]]</p>'' <blockquote>I don't have any idea who is the owner of 'solitity.co.in', but these pop ups are annoying and know that I click on any of the options - I will be in trouble for other things these pop ups can do to my computer. I would like to know exactly who is the party for this virus or adware were able to get it on my computer. I would like some simple instructions on how to delete this spam from my computer. </blockquote> https://support.mozilla.org/en-US/kb/push-notifications-firefox https://support.mozilla.org/en-US/kb/push-notifications-firefox#w_how-do-i-revoke-web-push-permissions-for-a-specific-site Are these small popups on the bottom right corner of Firefox window?. I f so then these may be web push notifications from sites you have allowed to send you notifications from. You can revoke these sites from sending you notifications.