MegaUpload DownloadHelper is a browser extension for Mozilla Firefox Google Chrome and therefore functional on any platform such as Linux, Mac or Windows and which fulfills a very specific goal: to make us forget about waiting times to start a download.
How? For automating the timeout when downloading files from MegaUpload and initiating the downloads automatically without our (just click on "download", then) so many of us who are used to manage this service.
The countdown has recently automated service so that now only serves to start downloading automatically, after the expected completion is a little over 20 seconds, so it will remain a useful extension.