Starting in version 74.0, Firefox will completely waive support for encryption protocols TLS 1.0 and TLS 1.1. At that time, the browser will prevent users from accessing websites that do not support TLS 1.2 or later by displaying a “Safe Connection Failure” error page. As early as 2018, Mozilla and other browser makers, including Google, Microsoft and Apple, announced plans to abandon TLS 1.0 and TLS 1.1 in 2020 to improve the security of Internet connections.
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Starting with Firefox 74, sites that use TLS 1.1 or earlier will not be able to load in the browser. It’s not just Firefox, Chrome and other major browsers, such as Microsoft Edge, Apple Safari, and so on.
In Firefox, the browser throws a “safe connection failed” error message with an error code of “SSL_ERROR_UNSUPPORTED_VERSION” and cannot bypass the error (because support for TLS 1.0 and 1.1 has been removed from the browser). Therefore, it is recommended that each site actively maintain and actively update to avoid incidents of connection disruption.
Finally, Firefox 74.0 Stable is scheduled to be released on March 10, 2020.