KatAndres Lv2Posted 07 Jun 2022 13:29
  
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.
Faisal P Posted 06 Jun 2022 14:34
  
Ensure that your Internet security software is the latest version.
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
jetjetd Lv5Posted 06 Jun 2022 14:03
  
you need to enable TLS 1.0 AND TLS by changing the value of security.tls.version.enable-deprecated value to "true"
regidorreyes Lv5Posted 06 Jun 2022 11:48
  
By default, Firefox 74 disabled TLS1.0 and TLS 1.1. So you must enable it by setting the security.version.enable-deprecated to value "true".
Newbie539301 Posted 17 Mar 2020 00:35
  
In Firefox 74 in the address bar type
about:config
Press Enter
Accept and proceed
Search for:
security.tls.version.enable-deprecated
Change the value to true.

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