Yeah, I look at resizeTO but since I am not a javascript guy and this is something that I never run into because I use the bootstrap template which has its own popup image modal, and on other templates which I rarely use, I install colorbox https://www.zen-cart.com/downloads.php?do=file&id=1322 which was most likely built to get away from doing popup images the stock way which are ugly. I haven't installed colorbox in a while so I am not sure that it works on 1.5.7 but probably does.
So could this be called a bug, maybe... it used to work once upon a time, but then Firefox changed something quite a while ago, based on my reading of other threads about it, but since fixing this would require someone decently versed in javascript to write up a function that takes the size of the image you want to show and probably add some percentage of padding to it to avoid Firefox adding scroll bars and passing that to the resizeTo... my head already hurts thinking about it. I'll just stick with using the Bootstrap template most of the time and when force to use responsive classic (trash) I'll install colorbox to sidestep the issue.
In your case I looked at a number of your sites and wonder why you even want to bother with having the large popup they seem to be just names of localities that are easily read, and the "large" image is not actually that much bigger than the one shown on the product page. Personally, I would just rip the ability to even open the large image out on yours
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