You can always use Aurora which is Firefox two versions ahead of release. So you would have had those features about a month ago.<p>I was for a long time hesitant thinking that it would be unstable, or cause compatibility issues with my favourite extensions... Nothing like that. At least in my experience. New sync worked completely flawlessly. I now use it on both Ubuntu[1] and Android[2] almost exclusively.<p>On Android it's faster than Chrome beta, perhaps partly due to AdBlock, and it has a nicer interface, especially closing tabs is much easier. It's not available from Google Play but it updates itself so you only need to download the .apk manually once (make sure you do it over ssl).<p>On desktop some changes brought by Australis are, let's say, not to my taste. Of course, there's already an addon to fix it[3]. You can keep whatever you like from the new UI, and revert whatever you don't. For example, I like the drawer but didn't like the inability to move back and forward buttons to the right of the url bar. They're back on the right[4]. Same goes for rounded corners of tabs, or any other control issue.<p>[1] <a href="https://launchpad.net/~ubuntu-mozilla-daily/+archive/firefox-aurora" rel="nofollow">https://launchpad.net/~ubuntu-mozilla-daily/+archive/firefox...</a><p>[2] <a href="https://www.mozilla.org/en-US/mobile/aurora/" rel="nofollow">https://www.mozilla.org/en-US/mobile/aurora/</a><p>[3] <a href="https://addons.mozilla.org/en-US/firefox/addon/classicthemerestorer/" rel="nofollow">https://addons.mozilla.org/en-US/firefox/addon/classicthemer...</a><p>[4] <a href="http://i.imgur.com/LE8UZHY.png" rel="nofollow">http://i.imgur.com/LE8UZHY.png</a>