Trickle is a portable lightweight userspace bandwidth shaper. It can run in collaborative mode (together with trickled) or in stand alone mode.
trickle works by taking advantage of the unix loader preloading. Essentially it provides, to the application, a new version of the functionality that is required to send and receive data through sockets. It then limits traffic based on delaying the sending and receiving of data over a socket. trickle runs entirely in userspace and does not require root privileges.
To install trickle in Ubuntu:
sudo apt-get install trickle
To start Firefox with a limit to the amount of bandwidth it consumes all you have to do is type in the command line.
trickle -d 200 firefox
this would start Firefox with a download limit of 200KB/s.
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