Aaand Nightly < Relase. Isn't it? :)

Referring to `nsIVersionComparator` [docs][1], `23.0a1` < `23.0a2` < `23.0` IMHO.
Therefore I changed the versions to be compatible with `aurora`, `beta` and `relase` channels of version `23.0`.
The old style would be compatible with `nightly` channel only.


[1]: https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/nsIVersionComparator