» How does "Once per Custom Cookie" work?
C5 Extras > Support > Knowledge Base > Popup Pro > How does "Once per Custom Cookie" work?

Once per Custom Cookie works the same as Once Only which launches the Popup Pro once for each browser (i.e. Chrome, IE, Firefox, etc.) the only difference is that in this option you can specify the name of the cookie being saved in the browser to prevent naming conflicts with other cookies.