When I download a *.blend file from ftp://ftp.cs.umn.edu/pub/blender/pub/demos/ (e.g. escher.blend) using the context menu's save link target, mozilla 1.0 (on Linux) adds a .txt at the end of the proposed file name and offers only the *.txt filter in the save file window. I think mozilla should not add .txt in this case, because I have to delete this wrong extension to use the file in a proper way. May be this is a MIME-Type problem.
*** This bug has been marked as a duplicate of 120327 ***
Verifying as duplicate.