How do I use Firefox?

I recently downloaded and installed Firefox.  After using it for a while, I decided it's okay.  However, is there some way to change Quickkeys and stuff?  I keep hitting "S" for "Save As" when I right-click an image, since I'm used to IE, and it keeps wanting to set the image as my Desktop Wallpaper.  So, how do I change key configuration?

Also, I found the place to empty out the Download window auotmatically, but is there some way to CLOSE the Download window automatically?

For #1, I don't know.  Try hitting "A" instead.  For #2, choose Tools > Options, click on the Downloads icon on the top row, and put checkmarks in the Download Manager options in the middle of the window: "Show Download Manager when downloads begin" and "Close Download Manager when all downloads are complete."