I have backupped my bookmarks using Firefox's functionality to do it automatically and saved the file to an external HD before I was making a clean installation of Windows, which means all my files were removed. Later on, after re-installing Firefox, I tried to use the backup I had so I can have all my bookmarks once again, but when I try to look for that file, it seems it has the wrong format (a regular "File" instead of JSON or HTML, not sure which one of them should it be). So I tried to change it to "*.JSON" and it still didn't shoe up in the dialog box. So I tried "*.HTML", which DOES show up but everytime I try to import it, it actually does nothing.

I really need this file since it contains many sites that I need. Thanks in advance.