It’s actually easier than you thought.
Tools > Preferences > Search
Select search engine which is used in your speed dial (Ask.com, if default)
Edit > Details > uncheck “Use as Speed Dial search engine”
About (Author Profile)
Vygantas is a former web designer whose projects are used by companies such as AMD, NVIDIA and departed Westood Studios. Being passionate about software, Vygantas began his journalism career back in 2007 when he founded FavBrowser.com. Having said that, he is also an adrenaline junkie who enjoys good books, fitness activities and Forex trading.