I was able to make this one work but none of the other ones.
If you ask me, all of them are online and can probably be downloaded via premium account (because this goes over their API) but not as a free user because there seems to be a mediafire encoding bug.
Short answer: This is a serverside mediafire.com bug!
Detailed explanation:
You can simply reproduce this:
1. Grab any of your URLs which is NOT downloadable (so any except the first one).
2. Find the ID of the file e.g.:
mediafire.com/file/
FILEID/filename.ext/file
3. Use the API to access the file information:
mediafire.com/api/1.4/file/get_info.php?r=ucbm&quick_key=
FILEID
4. Check the response parameter "normal_download" --> Decode this --> You will not be able to open it in browser.
If you want you can report this issue to the mediafire development team --> It is NOT a JDownloader issue!
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-psp-