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Don't work with Author Australis Theme 2.0 Rated 4 out of 5 stars
Good! Must be integrated in Firefox by default.
But, don't work with Author Australis Theme 2.0
Please try version 1.2 https://addons.mozilla.org/en-US/firefox/addon/tabs-always-in-titlebar/versions/1.2 Australis compatibility should be fixed.