Now that the Google secure search offering has matured in terms of scale and performance Firefox is moving to use Google secure search as it’s default search provider.
From a privacy / security perspective this is great news as it makes it much more difficult for people to view your searches / search terms. As always, the solution is not foolproof and Google breaks the ‘security’ for paid advertiser links etc. However this is a good step in the right direction for improving security / privacy and specifically search security / privacy online.
More details can be found here;
If you want to use Google secure search yourself, just replace http with https in the address bar when you use Google search.