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Squarespace Lightbox Anything Plugin
With this plugin you can create a lightbox pop-up from any text, button or image link. Useful for displaying size charts, newsletter forms, galleries, video pop-ups anything that you can add to a page.
$49
Squarespace Video Lightbox Button Plugin
Turn a video link into a lightbox/modal popup on any Squarespace site (buttons and galleries included).
$29