How to limit download traffic in Firefox

Is there a setting in Firefox to limit the download traffic speed? For example, I want to download some files using Firefox with max. 200 kbps whereas I want to use the remaining limit to download some other files with a torrent client.

Note: I don't like to use an external download manager. I'd prefer a Firefox add-on instead.


Downthemall has a per-server speed limit which you can configure under Network Preferences. Wildcards (*) for a global limit don't seem to work though.

Network Preferences