Firefox have released version 11 and the current DownloadStudio Firefox addon only supports up to Firefox version 10, if you have Firefox 11 or greater and would like an updated DownloadStudio addon that will work with this version you can download it from http://www.conceiva.com/downloads/downloadstudio.zip. You will need to rename the file's extension to .xpi in order to install this in Firefox.

1. Rename the downloaded file to 'downloadstudio.xpi'
2. Drag and drop this file onto Firefox