Neat Download Manager for Windows, Chrome and Firefox is a powerful but lightweight download manager.
The browser extension/add-on integrates with the Windows version and will then seamlessly send all your download links there for processing. Not only can it be for standard downloading but it is also capable of helping you to download video/audio as well. But the author notes, it is not capable of downloading YouTube videos and encrypted media files.
Neat Download Manager is designed to be simple to use while not consuming too much of your hardware resources (CPU, Ram, Power, etc.).