I've been using DDG as default search engine in Firefox, with Google on fallback under the keyword "g". You can make a bookmark with a URL like
https://encrypted.google.com/search?hl=en&q=%s
and add arbitrary keywords to the bookmark, like "yt", "g", or "so". Then you can simply enter that keyword followed by the search term in the address bar.DDG definitely doesn't have the same quality results as Google, but it's close enough in most circumstances for me that the times I have to search twice aren't a huge factor.
replies(1):