
The problem with a standard web browser is that it assumes you want to catch all your downloads within one folder or requires you to specify a destination every time you choose to save a file. Even though Firefox 3.1 is forthcoming, the download manager still assumes a 'catch all' approach to managing your downloads. You could use a separate download manager, but they are more orientated towards downloading files more quickly.
Advanced Save Folder 0.9.1 is an experimental add-on for Firefox that enables you to specify a folder for your downloads based on the file extension or source website. For example, if you want to move your downloaded .mov files in to a specific folder, you can set this up. Alternatively, you can force all downloads from a particular website to download to a unique folder.
Advanced Save Folder link.
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