[ubuntu] Unable to download in firefox

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http://ubuntuforums.org – In firefox, I receive the error message "<file>,could not be saved, because you cannot change the contents of that folder." every time I try to save to a folder outside the default firefox downloads folder. I receive this message even if I am owner of the folder and I explicitly have write permissions to that folder. I've even tried setting permissions 0777 with no luck. I have the issue every time I right click on anything (a link, an image, a file) and try to "Save image as.." etc. This has been happening since the firefox included with Ubuntu 10.04 LTS. I ha (Hardware)