This happens in safari (and possibly other browsers, haven't yet verified) with regard to the "deep_link" function. Blocks loading of widget.
https://www.dropbox.com/s/l376b85xh43apfe/Screenshot%202016-04-08%2019.39.25.png?dl=0
https://github.com/vdw/Tabslet/blob/master/jquery.tabslet.js#L176
According to spec, using strict mode, functions cannot be declared within any logic blocks, and this is currently being declared within an if block.