I hate to jump in and complicate anything but.....
It seems the ability to search for anything on the site is quite out of sorts. I have attempted to search for rainlendar skins that match particular blinds, as well as docs and rightclicks...and more often than not get a blank page as a result. Often, I can find the skin on Wincusatomize if I Google it when an in-site search fails.
I have tried different browsers, clearing the cookies, etc. and it doesn't change the fact that WC's search of itself seems broken on more than just a few occasions.
For example...when I search 'Garnet Storm' I don't even get the windowblind. The page reports back ....
Your search returned no results.
I'm not sure if this could account for the issue folks are having finding the FF skins and apologize in advance if it's off topic. It's been bugging me for a bit and would love to see it fixed. It certainly would help people to 'complete' a theme as it were as well as improve the sites overall usability and rep.