1) Start Firefox. Icons in the Navigation Toolbar are very large and blow up its size vertically. 2) Right-Click customize click "Small Icons" to check. Click "Small icons" a second time to uncheck. 3) Icons return to smaller size (but bigger than "Small icons"). Navigation Toolbar isn't blow up vertically. Screenshots in bug 738895, this is similar behavior except that it doesn't require a browser restart.
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0 Build ID: 20130408165307 I can confirm this one, but with a slightly different scenario: 1) Start with a new profile 2) Install GreaseMonkey, restart: GreaseMonkey put its button in the toolbar. 3) In customize toolbars, check and uncheck "Small icons" 4) Open a new window : Icons are big (see attachment) 5) Click on the download button : Icons get back to their normal size
This regressed further with Australis: Now clicking any icon has no effect, and the navigation bar is forever bloated.
Thanks for reporting - removing the small icons mode was an intentional design decision made in bug 863299. An add-on like this one: https://addons.mozilla.org/en-US/firefox/addon/classicthemerestorer/ can give you back small icons mode if you so desire.
Wait, so you're saying the size of icons that made them fit in the default address bar was removed, and the one that causes the address bar to bloat was kept? >An add-on like this one: https://addons.mozilla.org/en-US/firefox/addon/classicthemerestorer/ can give >you back small icons mode if you so desire. As well as breaking Recently Closed Tabs, Recently Closed Windows, and god knows what else. This isn't a viable workaround.
Filed bug 942165 regarding the current situation with add-ons.