Instead of loading everything with http:// consider using // instead, similar to the way Google's CDN recommends things be loaded, as it stands the bookmarklet won't work on https:// sites.
I see that grid-displayer include jquery.min.js . But when I click the bookmarklet on a dev site that does not include jquery, I get a popup error "The grid displayer requires jQuery + Bootstrap or Foundation."
I am using Foundation, but we are using Angular and have no intention of adding jQuery to our site. Apparently, grid-displayer isn't finding the copy of jquery it comes bundled with (nor does it know how to load it from a CDN if it's missing).