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Any software installed on the system can add root CAs to both of them.

• rictic 12y ago
  This may no longer be true for Chrome at least. They recently added protection against unauthorized configuration changes by third party programs. I'm having trouble determining whether that protection extends to root CAs though.
  • ryan-c 12y ago
    Chrome, last I checked, mostly relies on the OS list of trusted CAs in OS X and Windows, and brings its own on Linux which uses NSS.