This package generate a tree out of a HAR dump.
The core dependency is ETE Toolkit, which you can install following the guide on the official website: http://etetoolkit.org/download/
Note: if you don't want to export the tree to an image using PyQt4, no need to do the virtualenv magic.
If you like using virtualenv and have pew installed you can also do it this way:
sudo apt-get install python-qt4
pip install -r requirements.txt
pew toggleglobalsitepackages # PyQt4 is not easily installable in a virtualenv
pip install -e .