How To Enable TLS 1.3 on Microsoft Edge

Since TLS 1.3 is disabled by default, it needs to be manually enabled
for each browser. Currently, Internet Explorer 11 and Edge do not
support TLS 1.3 but will be supported in the next updates to come,
according to sources from Microsoft Insider Program.
If you wish to enable the experimental version, follow the steps below
to enable it on Microsoft Edge as well as Internet Explorer.

• Type inetcpl.cpl in Run and press Enter.
• In Internet Properties, go to the Advanced tab and scroll down
  to the very bottom. Check the box next to Use TLS 1.3.

Click on Apply and Ok. Reboot your computer for the changes to
take effect.
The Edge browser can now be used to connect to any website or
server running TLS 1.3. This configuration also takes place on Internet
Explorer simultaneously as well.
You can also disable TLS 1.3, or any other version by navigating to
the Internet Properties window and unchecking the corresponding
boxes.

Enable TLS 1.3 on Google Chrome

In the case of Google Chrome, a flag needs to be set to enabled in
order to run TLS 1.3.

Write the following in the address bar on Google Chrome:
chrome://flags

Search TLS in the search bar.

• In the drop-down menu next to TLS 1.3 hardening for local
  anchors, select Enabled.

Now click on Relaunch at the bottom of the page.
This will now relaunch Chrome with the new settings applied, and TLS
1.3 will now be enabled.

If you ever need to disable TLS 1.3 on Google Chrome, simply go to
the flags page and select Disabled from the drop-down menu.

Enable TLS 1.3 on Mozilla Firefox

Mozilla Firefox also has a unique way of running TLS 1.3.

Enter the following in the address bar on Firefox:
about:config

If you are presented with the Proceed with caution page,
click Accept the risk and continue.

There will be a search bar at the top of the page. Enter the
following:
security.tls.version.max

Now double-click the security.tls.version.max and change the
value to 4.

Relaunch the browser and you should now have TLS 1.3 running
on Mozilla Firefox.
In case you wish to revert to the settings, just change the value
of security.tls.version.max to 3, and relaunch the browser.