Mozilla has made a small but important change to the way that its Firefox browser handles search queries directed to Google, making the search provider s encrypted search service the default option. The change is not in the stable version of Firefox yet, but users who download the daily beta builds can access it now. The switch to using HTTPS for search by default is a major steo forward for Mozilla in terms of protecting the privacy of users search queries. Google has had an option for encrypted search for some time now but has not made that option the default for its own Chrome browser.
Source: https://threatpost.com/firefox-users-get-secure-google-search-default-032112/76351/