A couple of days back while testing something I found the below warning in my Firefox console (Press F12 to get access to console).

as per the warning cookie from my application will be rejected soon, though they have not mentioned any timeline by when the cookie with current attributes will be supported?

through there is documentation which explains a bit about options one can use for Set-Cookie to solve but that depends how you are setting your cookie..

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie

Coming to solution part, if you are using apache then you can make global change in httpd.conf file, one can also do from other places like using HTACESS file or depends on the application cookie setting mechanism.

To solve the issue from apache. Below are the steps:

ENV:

CentOS 6.x,7.x 
Apache 2.2.x

  • Open /etc/httpd/conf/httpd.conf file Check if mod_headers.so is loaded if not do so by below command (in default apache installation it should be there already) LoadModule headers_module modules/mod_headers.so

  • Add Header fix. I have added Http with secure settings in Set_Cookie to make sure that SameSite attribute have secure value.

    <ifmodule mod_headers.c>

    Header always edit Set-Cookie (.*) "$1;HttpOnly;Secure;SameSite=Strict"

    </ifmodule>

  • Finally, restart the webserver (apache)

      service  httpd restart

Done!

Now, FF Warning should go and hopefully cookies should be allowed.

All the best!