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what is oldest Firefox version to support TLS 1.2

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I want to know what is the oldest version of Firefox to support TLS 1.2. What about version 48 ? Thanks !

I want to know what is the oldest version of Firefox to support TLS 1.2. What about version 48 ? Thanks !

Chosen solution

Hello Pat07,

The oldest Firefox that supports TLS 1.2 is Firefox version 23, but I'm definately not going to suggest to use an older Firefox version .....

NOT recommended, but you can set any Firefox version to
use TLS 1.2 :

Type in the address bar about:config and press Enter (promise to be careful, is asked)

Type in the search bar security.tls.version.max

and set its value to 3

Then close and restart Firefox.

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  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0

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WestEnd
  • Top 25 Contributor
60 solutions 5366 answers

You have to provides links to what your talking about if you want others to read and see what and where your getting those information at?

You have to provides links to what your talking about if you want others to read and see what and where your getting those information at?
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McCoy
  • Top 10 Contributor
521 solutions 4861 answers

Chosen Solution

Hello Pat07,

The oldest Firefox that supports TLS 1.2 is Firefox version 23, but I'm definately not going to suggest to use an older Firefox version .....

NOT recommended, but you can set any Firefox version to
use TLS 1.2 :

Type in the address bar about:config and press Enter (promise to be careful, is asked)

Type in the search bar security.tls.version.max

and set its value to 3

Then close and restart Firefox.

Hello Pat07, The oldest Firefox that supports TLS 1.2 is Firefox version 23, but I'm definately not going to suggest to use an older Firefox version ..... NOT recommended, but you can set any Firefox version to <BR>use TLS 1.2 : Type in the address bar '''about:config''' and press Enter (promise to be careful, is asked) Type in the search bar '''security.tls.version.max''' and set its value to '''3''' Then close and restart Firefox.
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Question owner

Thanks #McCoy !

Thanks #McCoy !
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McCoy
  • Top 10 Contributor
521 solutions 4861 answers

Pat07 said

Thanks #McCoy !

My pleasure  !

''Pat07 [[#answer-1232416|said]]'' <blockquote> Thanks #McCoy ! </blockquote> My pleasure !
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cor-el
  • Top 10 Contributor
  • Moderator
17407 solutions 157253 answers

Actually this enabling TLS 1.2 (and TLS 1.1) happened in Firefox 27 (TLS 1.1 was skipped).

Bug 861266 - Implement TLS 1.2 (RFC 5246) in Gecko (Firefox, Thunderbird), on by default [27]

You shouldn't set security.tls.version.max to a value higher than its current default. If a higher TLS version isn't enabled in Firefox then this is done for a reason (stability or unfinished support). This happened with TLS 1.3 for a long time (52-59) that got only enabled in Firefox 59 as a test and by default in 60and later.

Actually this enabling TLS 1.2 (and TLS 1.1) happened in Firefox 27 (TLS 1.1 was skipped). Bug 861266 - Implement TLS 1.2 (RFC 5246) in Gecko (Firefox, Thunderbird), on by default [27] You shouldn't set security.tls.version.max to a value higher than its current default. If a higher TLS version isn't enabled in Firefox then this is done for a reason (stability or unfinished support). This happened with TLS 1.3 for a long time (52-59) that got only enabled in Firefox 59 as a test and by default in 60and later.
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