The first thing that this has got going for it is that it can automatically detect downloads starting in both Firefox and Chrome. So there is no need to actually start it in Download Manager. As long as Download Manager is running in the background, it will know when something starts in one of those browsers. It will also monitor the clipboard for any downloads.
Overall, using an app like this often makes downloads faster, plus if the browser was suddenly to crash and close, Download Manager would be able to pick up the download where it left off.
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