No I don't think thats stupid.
First what have you done to try and change it?
And second if they were really trying to get you to change to netscape why woould they ever update mozilla in the first place. Seams like a lot of work on their part just to get you to change.And third you can change it. Thats why Mozilla is part of the open source market. I would think that if you could find the icon(?) file that changes the cursor then you could find a way to change it to anything you want.
Fourth, what about a different theme? You are even allowed to make those.
And finally. Calm down man, its only a cursor.