The "bug," reported to Mozilla by privacy researcher Christopher Soghoian over a year ago, is in fact a feature: Web browsers rely on unprotected HTTP connections for Web search, thereby allowing anyone with access to Deep Packet Inspection tools, like ISPs or governments, to monitor and censor search data.
In addition, Web browsers using HTTP connections leak search queries through the "referrer header"--the keywords entered as search queries are transmitted to the destination website when a link returned in a search results list is clicked. Websites receiving search traffic happily collect this information because it's valuable for marketers to know the search terms that brought visitors to their sites.
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Having begun tests of HTTPS search in 2010, Google last October said it would relay search queries over encrypted HTTPS connections for all signed-in users. In so doing, the company is shielding Internet packets from prying eyes and preventing the transmission of search query keywords to websites. But the percentage of Google searches conducted by signed-in users remains quite small: Google engineer Matt Cutts has suggested that less than 10% of Google searches come from those signed-in to their Google Accounts.
Mozilla has gone a step further, enabling HTTPS by default in Firefox, thereby making privacy protection available to all users of its browser.
"We are currently testing the change to use SSL for built-in Google searches in our Firefox nightly channel," a Mozilla spokesperson said via email. "If no issues are uncovered, it will move through our Aurora and Beta release channels before eventually shipping to all our Firefox users. This will include migrating the changes to our non-English version of Firefox, as well."
So it may be a few months before the average Firefox user sees this change, which the Electronic Frontier Foundation has been trying to encourage through its HTTPS Everywhere campaign.
"This is a big deal for the 25% or so of Internet users who use Firefox to browse the Web, bringing major improvements in privacy and security," Soghoian wrote in a blog post on Wednesday.
Soghoian, incidentally, filed a complaint with the Federal Trade Commission against Google in 2010 for claiming to support privacy but failing to take action to prevent browsers from leaking search queries, which Google has acknowledged may reveal personal information.
Soghoian credits Google with supporting Mozilla's decision to implement HTTPS by default--Google has a search deal with Mozilla and will end up processing the more resource-intensive encrypted traffic--but questions why Google's Chrome engineers have allowed themselves to be beaten to the punch.
"For the Chrome team, whose browser has otherwise set the gold standard for security (and who have proposed and implemented a mechanism to enable websites to limit referrer leakage), this must be extremely frustrating and probably quite embarrassing," he wrote. "Hopefully, they will soon follow Mozilla's lead by protecting their users with HTTPS search by default."
Google did not immediately respond to a request for comment.
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