seeking tool to help with file download placement

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http://www.linuxquestions.org – I go to the web looking for all sorts of information. Yes, I also look for music and images and videos. I'm looking for some sort of utility or browser extension that will help me sort out all of these downloads. The tool might work like this:I request a download of some file, say mumble.pdf The mime type, coupled with the file extension, tell the utility what sort of file I'm grabbing. While I sometimes get the options to SaveHere when I request a download, usually the files end up in the default download folder. Instead, I'd like to tool to see that I'm grabbing a PDF, and download into my (HowTos)