rivsy Lv5Posted 06 Jun 2022 14:24
  
Last edited by rivsy 06 Jun 2022 16:10.

TLS 1.0. and TLS 1.1 have been deprecated in current Firefox releases and have been disabled.
You can still enable TLS 1.0 via the button on the error page although this is not recommended.
On the error page there is a blue "Enable TLS 1.0 and 1.1" button and clicking this button will set this pref to true.

security.tls.version.enable-deprecated = true
Note that you shouldn't use the about:config page to flip the security.tls.version.enable-deprecated pref.

Please see below official link from firefox:
https://support.mozilla.org/en-US/kb/about-config-editor-firefox

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