Unfortunately, WebExtensions does not have the functionality for the correct operation of this addon, so it will no longer work with the release of Firefox 57 in November 2017. The extension still works on XUL-based Firefox forks like Waterfox and Pale Moon
Torrent Tornado is a BitTorrent client for Firefox and SeaMonkey that allows users to download Torrents directly from their browser without any additional software.
Torrent Tornado can download Torrents directly to your Downloads folder and can handle large files (multi-gigabyte files) with ease.
Hint! * Magnet-URI association * .torrent file-type association * drag&drop torrent-link (or magnet-link or local file or file from statusbar of Download Manager (S3) ) to toolbar-button "Torrent Tornado"