> Opera has Google set as a default search engine and doesn't allow to change that You mean the search bar when opening a new tab? True, that's always Google.

> Opera has Google set as a default search engine and doesn't allow to change that You mean the search bar when opening a new tab? True, that's always Google. But if you go to settings, the third thing from the top is managing search engines, and setting the default to use for things entered in the address bar :)