Thanks for reporting.
File content for link #3 was removed by the way.
This was fixed in mediafire plugin 3.0.4 :
- for validation issue, I've tested more than 20 links in mediafire plugin 3.0.4, and all links was successfully validated.
- if you get "Loading file failed" error, or something like that (I forgot the exact error message), that's server problem, and that's rarely happens. It happens in browser too, browser failed to save the file, and reload the page instead. Just give FRD another try to download the link, it usually works.