Aria2 Download Manager Integration by Ross Wang

Features:

• Replace Firefox's built-in download window directly, no need to click the download button in Firefox's built-in download window first or use the context menu to start a download.
• It's able to send Headers (referrer, cookies) to Aria2
• Run and shutdown Aria2 automatically.
• Automatically obtain and pass Proxy settings to Aria2.
• You can 'open' the download link

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You need to download and start Aria2 by yourself, complete at least 'Protocol,' 'Host,' 'Port' and 'Interface' in the options page and then click the 'Save' button.

If you don't want to start Aria2 manually, just write a program to start Aria2 in the background and register it to system's AutoStart or browser's NativeMessagingHosts
You can find the sample files here.

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Aria2 is a multi-threaded downloader that also supports torrent and magnet.
https://aria2.github.io/

This add-on uses Mayswind's AriaNg.
https://github.com/mayswind/AriaNg