Firefox could not install the file at https://addons.mozilla.org/firefox/downloads/latest/3794/addon-3794-latest.xpi?src=addondetail because: Download error -228 How do I fix this? I recently deleted all my cookies and then this started happening when dowloading add ons. I was only able to download 1 ad on (adblock plus). All others I get this error? I already have my cache hold space set to 50MB.