See Options/Preferences -> Content: Pop-ups : Block pop-up windows *https://support.mozilla.org/kb/Options+window+-+Content+panel You can inspect and manage permissions for the domain in the currently selected tab via these steps: *click the "[[Site Identity Button|Site Identity Button]]" (Control Center 'i' button) at the left end of the location/address bar *click the arrow to expand the security message *click "More Information" to open "Tools -> Page Info" *click "Permissions" to inspect and modify permissions You can alternatively go to the Permissions tab (Tools -> Page Info -> Permissions) to check the permissions for the domain in the currently selected tab. *https://support.mozilla.org/kb/page-info-window-view-technical-details-about-page