Firefox was downloading the file fine until it got to um...probably 2<sup>32</sup> bytes or something, and then it completely borked. Then I tried flashget, and freshdevices' download manager, and now I'm trying getright.
But just in case getright fails, what's a download manager that supports larger file sizes?
(just in case you wanna know, I'm downloading a huge media file from www.archive.org)