Let's see if we can improve the packaging and building of our Firefox.

* Try to use ld-limiter, so only link jobs get reduced - depending on the arch in use - rather the %jobs / %_smp_mflags. It would be really nice if FF migrated away from Autotools, though;
* Try to make use of OBSCPIO archive to help decrease disk space usage on OBS servers;
* Try to automate a pipeline that makes use of the Beta channel to improve the feeling for the next release version;