When i try to download a FLV video with Firefox, it open me a new page with the flv code instead of downloading the file.

Like this:

Code:
FLV???	?????J????????
onMetaData???	?duration?@F‘ë…¸R?
videodatarate?@tÅ$€kp?lastkeyframetimestamp?@Fˆ“t¼j?lastkeyframelocation?A<–Ð?????creator?
YouTube, Inc.?metadatacreator?YouTube Metadata Injector.?haskeyframes?hasmetadata?	keyframes?times
???.???????????õS÷ÎÙ‡??öffffff??÷xÔýó¶F??ø‡+Iº??ù™™™™™š??ú¬1&éy??ûº^5?|î??üÌÌÌÌÌÍ??ýß;dZ¬??þ*‘hr°!?@????????@?‰7KƧð?@bMÒñª?@©ûçl‹D?@‰7KƧð?@™™™™™š?@»dZ¬?@"ÌÌÌÌÌÍ?@&ª~ùÛ"Ñ?@(ÌÌÌÌÌÍ?@,D“t¼j?@,ffffff?@,ˆ´9Xb?@,ª~ùÛ"Ñ?@,ÌÌÌÌÌÍ[email protected]“t¼j?@/»çl‹C–?@1ÌÌÌÌÌÍ?@2»¥ãS÷Ï?@3»¥ãS÷Ï?@4îÙ‡+?@7ªÀƒn˜?@8Ýó¶E¡Ë?@:Ýó¶E¡Ë?@<"Iº^5?@>ˆr° Äœ?@@D9XbN?@AîùÛ"Ðå?@B»Æ§ï²?@D333333?@E÷l‹C•?@FnùÛ"Ðå?@Fwl‹C•?@F€??????@Fˆ“t¼j?
It only do this with firefox, works fine with IE. Any idea why?