Install into /usr, not /usr/local.
Update to upstream version 0.6.1.
fix wrong-file-end-of-line-encoding warning.
Require firefox without alternatives.

Geierlein requires on of firefox, iceweasel or xulrunner. But
a) RPM can not require alternative packages
b) Mageia only provides firefox, no xulrunner.
So I reduced this requirement to jsut "firefox".