HowTo get the sources and compile them
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 checkout the source as follows:
svn checkout https://svn.jondos.de/svnpub/JonDoFox_Exension/trunk
Afterwards change the directory to trunk and run the appropriate shellcript:
cd trunk && ./makexpi.sh
Now you'll find the freshly built .xpi in the directory xpi.