Smart HTTPS - Automatically changes HTTP addresses to the secure HTTPS, and if loading encounters error, reverts...
Element.io - Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
SSL Enforcer - SSL Enforcer - Force SSL/TLS encryption for any browser or app. Block all unsecure connections.
ChatSecure - ChatSecure is a free and open source messaging app that features OTR encryption over XMPP.
KB SSL Enforcer - This extension enforces encryption for websites that support it as much as currently possible in...
Keybase Chat - End-to-end encrypted chat built into Keybase