Mozilla Firefox contains a basic but functional download manager. It enabes you to right click on a download link and retry or cancel the download progress. However, you can't do too much more than this. There are loads of external download managers out there, but there are two that integrate in to Firefox as an extension.
DownThemAll is an extension that will enable you to mass-download a range of files, mainly from the download links on a web page. For instance, if you're wanting to download a load of home videos stored on a friends site, simply select the page and DownThemAll will locate the links and will download the files. You can leave your computer and do something more interesting, whilst they are all downloading.
FlashGot is more of a traditional download manager that enables you to download individual files and includes acceleration technology so that you can grab your downloads much quicker. FlashGot is also a Firefox extension. Give them a go and, as they are extensions, they can be remove rather easily.
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