We wouldn’t want to override the content or break other plugins, so we didn’t make it global; but you can try adding this to js/functions.js at the top (say, on line 8, just above page functions):
$("a[href$='.jpg'], a[href$='.jpeg'], a[href$='.png']").addClass("view");
This is just off the top of my head, haven’t tested, it may or may not work, as it basically adds a class after the HTML structure is generated and interpreted (so there is a chance the lightbox triggers earlier and doesn’t see that added class, rendering the code useless).
Regards,
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Cosmin
Support Assistant