[Bookmarkdd] BDD not working!

[Jonathan Slavid]

when i try to install BDD, I get this message:
*
"Firefox could not install the file at

http://releases.mozilla.org/pub/mozilla.org/extensions/bookmark_duplicate_detector/bookmark_duplicate_detector-0.4.0-fx.xpi

because: Not a valid install package"

*Please help!  I love BDD and i cannot live without it. 
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