Mozilla has recently released update 35.0 for Firefox which includes various performance fixes and a few new features. The full release notes for this update can be found here.
The most noticeable change is that the search bar now defaults to Yahoo Search. You can easily change this default to another search engine. Just click the Magnifying Glass icon and then click Change Search Settings.
In this window you can select your default search engine from the drop down menu.
That’s it, now you can resume using whichever search engine you’re familiar with!