Thanks Joey.

And I found the url for listing a server's tls extensions here:

http://possible.lv/tools/hb/?domain=yahoo.com

Do you know how we can enable/test the extensions using firefox or any other 
browser?

--------------------------------------------
On Mon, 12/4/17, Joey Yandle <xol...@gmail.com> wrote:

 Subject: Re: [openssl-dev] Known apps supporting tls max frag size extn
 To: "Jitendra Lulla" <lull...@yahoo.com>, openssl-dev@openssl.org
 Date: Monday, December 4, 2017, 5:13 AM
 
 > Also, I have lost the url of a website
 which used to analyze any given server ( eg www.yahoo.com)
 for its supporting various tls extensions. You provide the
 server url and it will display all the tls extns supported
 by that server.  If you know of any such url, could you
 please help me with that also.
 >
 
 
 openssl s_client has an
 argument -tlsextdebug:
 
 $
 openssl s_client -connect www.yahoo.com:443 -tlsextdebug
 CONNECTED(00000003)
 TLS server
 extension "renegotiation info" (id=65281),
 len=1
 0001 - <SPACES/NULS>
 TLS server extension "EC point
 formats" (id=11), len=4
 0000 - 03 00 01
 02                                      
 ....
 TLS server extension "session
 ticket" (id=35), len=0
 TLS server
 extension "heartbeat" (id=15), len=1
 
 
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