Idk how this works as an extension, cause im using your other version https://userstyles.org/styles/100548/firefox-small-icons - not only shrinks the navbar height, but moves tabs into the titlebar in "normal" window mode reduces icon padding. Heres a comparison http://oi58.tinypic.com/ohjv2f.jpg Thanks
Perfect in my opinion. It's only for Australis, if you have another theme or you want to change the appearance to old school firefox use Classic Theme Restorer. If you only want to gain some space and have the small icon option in Autralis this is your choice, very easy an functional (much easier and less buggy than CTR).
Absolutely fantastic function. Exactly what I wanted. Bravo!
"Classic Theme Restorer" was overkill for me, because I actually like the new Australis look and only wanted the sloppy wasteful vertical toolbar space fixed. "Australis Small Icons" does JUST that, and without having to lose the new style of the back/forward buttons. Plus, even more window titlebar space is reclaimed, and the overall spacing is perfect. Awesome job, well done!!!