adding websites to location permissions in firefox

I cannot find a way to add websites to the location permissions in Firefox Windows PC. I can easily get to the "Location Permissions settings " but there is no way to add, only remove. When I display the access icon in the URL address bar, it shows " you have granted the website additional permissions" , but the site does not display in the FF Settings-Location Box, and the target website does allow me access based on location. Is there another area where location is restricted? would appreciate some help, thx.