okay, when you were "deleting everything form your home folder" by chance did you delete stuff from your .mozilla folder?
try adding this to you .mozilla/firefox/*.default/mimeTypes.rdf
Code:
<RDF:Description RDF:about="urn:mimetype:handler:application/x-download"
NC:alwaysAsk="true"
NC:saveToDisk="true">
<NC:externalApplication RDF:resource="urn:mimetype:externalApplication:application/x-download"/>
</RDF:Description>
<RDF:Description RDF:about="urn:mimetype:application/zip"
NC:value="application/zip"
NC:editable="true"
NC:description="Zip archive">
<NC:handlerProp RDF:resource="urn:mimetype:handler:application/zip"/>
</RDF:Description>
<RDF:Description RDF:about="urn:mimetype:application/force-download"
NC:value="application/force-download"
NC:editable="true"
NC:description="Zip archive">
<NC:handlerProp RDF:resource="urn:mimetype:handler:application/force-download"/>
</RDF:Description>
<RDF:Description RDF:about="urn:mimetype:handler:application/x-rar-compressed"
NC:alwaysAsk="true"
NC:saveToDisk="true">
<NC:externalApplication RDF:resource="urn:mimetype:externalApplication:application/x-rar-compressed"/>
</RDF:Description>
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