Australis has finally landed in Firefox Nightly and this presents and excellent opportunity for all Firefox Users to help test out nightly. Mozilla relies pretty heavily on user feedback and its nightly testers to help keep each release as crisp as possible.
Installing Nightly on Ubuntu
sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa
sudo apt-get update
sudo apt-get install firefox-trunk
Reporting Bugs in Firefox
Here is a very simple but robust guide on reporting bugs on Firefox
Feedback is really important to Mozilla in fact Mozilla has an entire team that focuses a lot of their attention on reading through feedback and advocating for changes in Firefox to meet the expectations and needs of users. You can submit feedback about Firefox by going to Help -> Submit Feedback or by clicking here.