Anyways, I've always wondered what the "nSN" constant in PluginFree meant, and now I know: it's the zoom value. It turns out that I've never tried zooming in on that viewer. The resolution of the images on Comic High and Comic Gekkin actually go up to 2000+ pixels high, which is pretty fucking good (see above image). The downloader now downloads the highest resolution possible, which fixes the bug with Comic Gekkin.
Online Manga Downloader 0.1.2 (MF)