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How do they do that? It's clearly Firefox related, in IE the same sites don't even show a favicon.
I know an example will say more, for instance, [addons.mozilla.org...]
This is a secure site but I have seen others who do this as well (http not https).
In Firefox if you go to [addons.mozilla.org...] you will see this text to the right of the favicon: Mozilla Corporation (US). In Opera you will see the same text to the right of the feed icon.
This is a browser-specific display for who owns various types of certification. When I hover over the text (not the favicon) in Firefox I see a tooltip that says "Verified by: GlobalSign". A right click provides expanded details.
When I hover in Opera I see a tooltip that says "TLS v 1.0 128bit ARC4 (2048 bit RSA/MD5)" - again, Transport Layer Security information. And a right click again provides exapnded details.
Here's some information for Opera, including a screenshot. They introduced this display in version 8:
You can see the site address is "bmtmicro.com" and the certificate was issued to "BMT Micro, Inc.". Hovering your mouse over the yellow indicator will display a tooltip telling you the strength of the encryption the site is using (the more bits the better). Clicking on the yellow indicator shows you the certificate details.[operawiki.info...]
For Firefox:
Firefox, for example, displays the security padlock at the end of the address bar as well as the lower right corner of the page where the rightful certificate owner’s name is displayed
for the visitor’s inspection. Mousing over either padlock yields information on the issuer
of the certificate.[verisign.in...]
Security certification information may not be confined to just the https: protocol and its certificates. Something like a digitally signed code certificate might also trigger the browser display, even on a non-secure page.
Had to do something with Firefox 3 and up, because in Firefox 2 and all versions of IE it didn't work this way.
So if all is right is should only be seen when accessing a secure site and only in the newest browsers (except IE). Didn't know that it is possible to use any kind of cetificate on non secure page. Can't see what it is good for.