The only external file that the 'juicebox.js' file loads is the CSS theme file ('jbcore/classic/theme.css').
I am unable to see your problem myself. Your web page looks similar (and is scaled the same) on my iPod Touch in both Chrome and Mobile Safari so I cannot replicate the problem in a test scenario of my own and try things out.
My iPod Touch 4 is limited to iOS 6.1.6 which, in turn limits Chrome to v37 so it looks like Google may have changed the way Chrome works (or perhaps there is a bug in v42).
Unfortunately, some trial and error is likely to be required in order to find a solution to your problem.
All I can really suggest is to try combinations of the following:
(1) Try removing the current meta 'viewport' tag from your page.
(2) Try locking the viewport using the following code:
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0">
This will prevent pinch-zooming but it might help in finding a solution to your scaling problem.
(3) With both (1) and (2) separately, try changing the value of expandInNewPage (AUTO, TRUE, FALSE).
I'm really not sure what else you could try that might make a difference.
SimpleViewer Support Team