What is a technical difference between "grey padlock" and "green padlock" in URL bar in browsers?

enter image description here

As an example we can take:

Both of them are signed by proper CAs.

So my questions are:

  • What is a technical difference?
  • How does it impact my browsingsecurity?
  • Are there some best practises what shouldn't be done on pages with "grey padlock"?
  • What OS and browser are you using? Have you looked at other browsers to see if there's commonality?
    – GdD
    Commented Dec 19, 2013 at 8:55
  • I don't think OS or browser does impact on differences in SSL certificates. Commented Dec 19, 2013 at 8:57
  • Just to be clear: W7/FF.26 Commented Dec 19, 2013 at 8:58

1 Answer 1


In Firefox, a grey padlock indicates that the site in question does not use an EV certificate. Sites using EV certificates shows up as a green padlock.

There is mostly no practical difference between the two types of certificates. Both are equally secure from a technical POV. For a more thorough answer about EV certificates, see What are the advantages of EV Certificate?

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