You can install each extension individually, or you can just clone the whole repo into your .ipython/extensions dir.

An Extension for managing periodic autosave of IPython notebooks

install the extension:

%install_ext https://raw.github.com/minrk/ipython_extensions/master/autosave.py

load the extension:

%load_ext autosave

autosave every 30 seconds:

%autosave 30

disable autosave:

%autosave 0

trigger single save from Python (just like clicking the save button):

%savenb

Enable 2x display of matplotlib figures

install the extension:

%install_ext https://raw.github.com/minrk/ipython_extensions/master/retina.py

load the extension:

%load_ext retina

Automatically generates floating table of contents inside your ipnb from the headers. Autoresize and scroll capabilities.

install the extension:

%install_ext https://raw.github.com/minrk/ipython_extensions/master/nbtoc.py

load the extension:

%load_ext nbtoc
%nbtoc

run %nbtoc once more to refresh the Table-of-contents