I've spent the last two days moving our SUSE-internal wiki to github.
It contains mostly information for getting started with maintaining and debugging Mozilla-products.
I still need to make a nice start-page with all chapters in a more sensible order, but please check out the individual pages already at:
Any contributions, corrections and wishes for more information are welcome!
Speaking of which @Wolfgang: The page "Build Service Structure" currently only describes the SUSE-side of things, as I have actually no idea how your repo-structure works :-) Would be great if you could add your side to the "Repos in OBS" section.