hello Spur52, while you're on the page in question, right-click somewhere on a blank spot and go to view page info > permissions to set the permissions for popups and other settings.

What are the pop-up settings?

It only makes sense to set to block exception a pop-up if you allow pop-ups by default

You can inspect and manage the permissions for the domain in the currently selected tab via these steps:

• Click the "Site Identity Button" (globe/padlock) on the location/address bar
• Click "More Information" to open "Tools > Page Info" with the Security tab selected
• Go to the Permissions tab (Tools > Page Info > Permissions) to check the permissions for the domain in the currently selected tab

You can inspect and manage the permissions for all domains on the about:permissions page.

• https://support.mozilla.org/kb/how-do-i-manage-website-permissions

Thanks - they ought to make it a little easier to be found