I think the design looks good, I just hope that it will be given the same amount of customization freedom Firefox enjoys pre-Australis.
My Nightly: http://i.imgur.com/1oPRtU2.png
I expect significant breakage tomorrow / later today.
http://i.imgur.com/8JIwdgh.jpg
Tab-scoll, to me, makes a lot of sense as it prevents any confusion over the content of the tabs, especially when those tabs lack favicons: in Chrome, you simply get a blank page icon when the scroll bar overflows.
The only downside to Australis for me so far has been the removal of the "thin" address bars/small icon sets, there is no longer an option within Firefox to enable them, as far as I know.
Oh, man. :/
You might also want to look into Stylish, this is a firefox addon that allows you to add custom CSS, and apply it without restarting.
On OSX, Australis will actually be thinner (once they fix https://bugzilla.mozilla.org/show_bug.cgi?id=938985) because the window buttons are now on the same level as the tabs.
This update will make it worse it seems and waste more vertical space (apart from the really ugly aliased curved tabs).
The good news is that if you don't like the new look of firefox, you don't need to see it: https://addons.mozilla.org/en-US/firefox/addon/classicthemer...
Of course there is `s` command to search any of your installed search providers and you can do all of this in new tab, window etc.
Pentadactyl is what keeps me using Firefox. When that stops working, it will take me back to stone age when it comes to speed of navigating and researching content online.
I'm generally OK with a lot of stuff being in add-ons. But, this one is not one of those things. I really don't think I should have to install a plugin to decide not to have a scrolling tab bar (I hate the scrolling tab bar).
http://i.imgur.com/PvlTZ3k.png
My tabs can get as small as the pinned ones on the left (which is the default behavior of every other browser).
There used to be a about:config setting for minimum tab width, but one(!) Firefox developer decided to remove it, because:
"Users can override this using userChrome.css if they absolutely want it. I don't think the prefs are worth it."[1]
Now I have to use a custom user chrome CSS file and disable the tab animations to get the same effect.
I really hope this pointless update won't make me jump through a dozen hoops again. I'm tired of it.
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=574654