Getting the error as End User
If you’ve come across Firefox error code ssl_error_rx_record_too_long as a user, your options are limited because most problems resulting in this error are web server related.
The best course of action is to clear your browser’s cache and try again. Possibly try to use another browser and see if that solves it. The likely reason for it is that you may have visited that same site in the past before it had SSL enabled, and ...