Shadowbox is an online media vieiwing application similar to Lightbox and Thickbox.
https://wordpress.org/plugins/shadowbox-js/
Widgets · WordPress Plugins
Get access to data on 47,866 websites that are Shadowbox JS for WordPress Customers. We know of 12,849 live websites using Shadowbox JS for WordPress and an additional 35,017 sites that used Shadowbox JS for WordPress historically and 6,398 websites in the United States.
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Get a list of 47,866 websites using Shadowbox JS for WordPress which includes location information, hosting data, contact details, 12,849 currently live websites and an additional 5,028 domains that redirect to sites in this list. 35,017 sites that used this technology previously and 6,398 websites in the United States currently using Shadowbox JS for WordPress.