here is about the same problem;
http://forums.cnet.com/5208-19411_102-0.html?messageID=3332476#3332476
Let's keep this to one discussion to avoid duplication and confusion.
I will lock this, and will add a note in your other discussion explaining that this seems to be a Firefox issue.
Mark
firefox 3.6.6 will not ask me where i want to save my download. i have made the necessary changes in the tools general tab. it automactically saves to my download folder which is okay but there are times when i want to save to my desktop. please help, larry

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic