Very useful, working perfectly so far. A bit fiddly to figure out what to write for the exceptions since you need to find the download server URL, not just the original website's.

One feature I'd like to see is the ability to turn exceptions on and off on the fly from the Firefox toolbar, because sometimes I might wanna download directly and sometimes open it in-browser.

Does not work on makerworld.com
It works on tumbnails, but not when you click to open the full sized image. Sorry I can't post an example URL

How to blacklist gmail? mail.google.com doest't work