Firefox when you save the picture takes its name from the alt, any way to fix it?

I did not take:
\rhabrastorage.org/storage/cbeeb2c8/79eb23c9/b636a960/7dc58721.png
\r
Search for installed plugins you have.

In the settings on the first page (General) in the section Downloads you can select Always ask me where to save files. I have is because I prefer to give proper names to files (or to change their signature according to their style of naming).
\r
By the way, I have the name of the image name when saving is taken from the address bar (Firefox 3.6.10 under Linux).