HTTPS 1.3 is by far the most secure version of the Transport Layer Security (TLS) protocol. Firefox and Chrome now support the new IETF standard, and Cloudflare is deploying as well for new zones. HTTPS Everywhere Everywhere is now using a MitM proxy appliance running at an Enterprise Internet gateway. MitM middleboxes have security issues that can be exploited by attackers, says Kurt Andersen, a board member of the M3AAWG Board of Directors. There are good arguments for doing so and good reasons for not doing so.”]
Source: https://www.csoonline.com/article/3545480/should-you-deploy-a-tls-13-middlebox.html