The latest Firefox 34 shipped with a revised search bar design. To be honest, I don’t like it because I need to change the default search engine from time to time and do not want to click my preferred search engine every time I search.
Lucky it’s possible to restore the previous design by modifying the Firefox configuration – to change ‘browser.search.showOneOffButtons‘ to false (details – http://forums.mozillazine.org/viewtopic.php?f=23&t=2890823)
Before
After
