It should be noted that this was a web-based survey, not a ranking by security audits.

> Our Web-based research study asked respondents to name up to five companies in 25 different industries they believe to be the most trusted for protecting the privacy of their personal information [0]

It's not terribly surprising that, given only five choices, more people chose some of the most well-known corporations in the world rather than the relatively PR-challenged Mozilla.

[0] http://www.ponemon.org/local/upload/file/2012%20MTC%20Report...