We can add magnet support to Firefox:

METHOD 1:

• Open firefox. Type the following in address bar:

about:config

• Right click > New > Boolean (see fig.02):

• Right click > New > Boolean (see fig.02):

• You need to enter new boolean value called network.protocol-handler.expose.magnet and set it to false.
• This allows you to assign a bittorrent client for all magnet links.
• For example, when you open a magnet link you will be prompted with a Launch Application dialogue box.
• From there you can simply select transmission or any other torrent client.

METHOD 2

• type “about:config” in the
• right-click on any link and select “New->String”
• string name: network.protocol-handler.app.magnet
• string value: /usr/bin/azureus
• right-click on any link and select “New->Boolean”
• enter name: network.protocol-handler.handler.external.magnet
• enter value: yes
• Restart firefox and you’re ready to go.

• Open a new tab, type about:config
• Right-click -> New -> Boolean -> Name: network.protocol-handler.expose.magnet -> Value -> false
• Next time you use the magnet protocol, it will give you the familiar “associate application” box.
• Navigate to your magnet-compatible client, (probably /usr/bin/azureus or /usr/bin/vuze but I don’t know for sure, as I don’t use that program) and there you go.
• Source: http://kb.mozillazine.org/Register_p…e_libraries.29

METHOD 4:

FF 47, Debian 9, KDE 5:

1.In about:config find “network.protocol-handler.expose-all”, change to “false”;

2. Click on some magnet link – a file browser pop-up should appear, show it full path to the executable (/usr/bin/qbittorrent for ex.);
3. Change “network.protocol-handler.expose-all” back to “true”;
4. Download the world.