Encrypted communication between your computer(s) and any Internet connected server, web servers being the most common, is essential for protecting anything transmitted and received between these devices, such as passwords, credit card information, etc.
This is achieved thru the use of a security communication protocol known as SSL (Secure Sockets Layer) and requires the host server to have installed a date and time stamped SSL certificate that is responsible for creating strong, encryption of all data sent between a host (web) server and client (end-user) computer.
Without SSL encrypted communication, as mentioned, everything you type and send (transmit) to a web server is in clear, plain and easy to read text, and is easy for a bad player to eavesdrop on all data (text) transmitted and/or received by your computer.
Overriding secure communication of a web browser is never a good idea and is akin to leaving your wallet full of money and credit cards unguarded when you are out in public, well traffic areas.