If you want to help the project, here are some more details:
How to develop
If you’re on Mac and you’ve checkout the project in ~/mystuff/omg you can run the app like:
$ /Library/Frameworks/XUL.framework/xulrunner-bin ~/mystuff/omg/src/application.ini
That’s if you’re using XULRunner. If you simply want to use Firefox, you can do:
$ /Applications/Firefox.app/Contents/MacOS/firefox-bin -app ~/mystuff/omg/src/application.ini
If you’re on Windows or Linux, the paths will be different but the principle is the same.
Note that this is for development, if you want to simply run the app, download the executable package (listed above) and don’t worry about those things.
Packaging for a new release
There’s only one requirement – you have to copy/paste the XULRunner dependencies in the respective directories: