How to get the sources and build a jondofox.xpi
It is probably the best to create a JonDoFox directory first and change to it:
mkdir JonDoFox && cd JonDoFox
Now you need a subversion client and check out the source as follows:
Afterwards change the directory to trunk and run the appropriate shellscript:
cd trunk && ./makexpi.sh
Now you'll find the freshly built jondofox.xpi in the directory xpi.