Most of the comments against EV certificates on this list have been focused on 
whether or not the current Firefox EV UI is relied on by Firefox users to make 
security decisions.  (Actually, I have only seen a Google paper on this issue 
in Chrome, no research from Firefox.)   

But there is an ecosystem of anti-phishing browser filters (e.g., Google Safe 
Browsing, Microsoft Smart Screen) and services (e.g., PhishLabs) as well as 
others that use the current identity information in EV certs to make better 
determinations of positive and false positive phishing sites and thereby 
protect users, as well as for other user security purposes.

Many on this discussion would like to see EV certs disappear entirely and move 
all websites to DV certs.  But remember, if EV certs disappear, so does all the 
EV identity information that’s being used today by security software to protect 
users.

So my question to those who want EV certificates to disappear is this: OK, then 
what is *your* plan for protecting users?  Browser filters will be weaker 
without EV information (and some browser filters today miss 20% of phishing 
sites at zero hour, according to NSS studies).  How will you replace the EV 
information that’s being used today by phishing filters and services to protect 
users?

Any decision on removing the EV UI in Firefox should consider all the related 
impacts on user security, and not just focus on a single issue (namely, “Do 
users rely on the EV UI?”), especially when the current Firefox EV UI is doing 
no harm.
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