"... If you have played around with a version of Firefox that was moved to Australis already, which is Nightly only or special builds, then you may want to voice your opinion on it. While there is little chance that Mozilla will undo Australis completely, it may resolve some of the issues that users are experiencing.
"Anyway, Mozilla has created a survey for users of Firefox 29 which they can use to voice their opinion on Firefox Australis. ... "
More Mozilla's Australis Survey gives you the chance to tell them what you think of it