OK, sorry 'bout that. I don't think you can add files directly. I think that you need to encounter such a file on the web first, and when Firefox asks you what to do with the file, you can select a program and click the box "always do this with this kind of file". It'll then be saved to the Download section. (It has been a while since I tried this, however.)
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I can't read your signature. Sorry.
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