As italocjs said four years ago this is clearly not the real downloader extension. I downloaded this and tried to get it to link with my FDM program and it did not work no mater what, restarting, updating reinstalling etc. As soon as i went to chrome web store and downloaded the original the extension and downloads worked perfectly and link to the manager.
Im not sure what this is, Most likely malware but do not download this. It does not work