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 51,108 websites that are Shadowbox JS for WordPress Customers. We know of 14,188 live websites using Shadowbox JS for WordPress and an additional 36,920 sites that used Shadowbox JS for WordPress historically and 7,143 websites in the United States.
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Get a list of 51,108 websites using Shadowbox JS for WordPress which includes location information, hosting data, contact details, 14,188 currently live websites and an additional 5,651 domains that redirect to sites in this list. 36,920 sites that used this technology previously and 7,143 websites in the United States currently using Shadowbox JS for WordPress.