How to Enable TLS 1.3 in Mozilla Firefox

TLS (previously known as SSL) is a web security standard that encrypts all the traffic between you and the website. This is basically a requirement for websites that offer logins, request personal information such as credit cards, or websites that have sensitive content (such as banks).[2] TLS 1.3 is a new web security protocol. It's main purpose is to enhance website security whilst increasing site performance[3] . Mozilla added support for the new security standard in Firefox 49[4] .


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Beginning with Firefox 52, TLS 1.3 is enabled by default.[1] (Posted 2017-07-04).


Steps

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    Update Firefox to the latest version available.
    • Updating Firefox will also give you the latest security patches and fixes[5]
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    In the address bar of Firefox, type about:config and hit ↵ Enter.
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    If presented with a warning, click or tap on I accept the risk!.
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    Type security.tls.version.max in the text box on the page.  Do not type it in the address bar.
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    Right-click on security.tls.version.max and select Modify.
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    Replace the number in the text box with 4.
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    Click or tap on OK.
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    Restart Firefox.  Close all tabs and windows and re-open Firefox.
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Warnings

  • Not all websites will support TLS 1.3 as it is a fairly new standard.
    ⧼thumbs_response⧽
  • An out of date browser makes you vulnerable to online threats[6] . Learn how to update Firefox.
    ⧼thumbs_response⧽
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Things You'll Need

  • Mozilla Firefox version 49 or higher

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References

  1. ↑ https://threatpost.com/mozilla-turning-tls-1-3-on-by-default-with-firefox-52/121461/
  2. ↑ Thawte, Inc. (US), https://www.thawte.com/resources/getting-started/ssl-faq/
  3. ↑ Cloudflare, Inc. (US), https://blog.cloudflare.com/introducing-tls-1-3/
  4. ↑ Mozilla Foundation (US), https://bugzilla.mozilla.org/show_bug.cgi?id=1250568Softpedia, http://news.softpedia.com/news/mozilla-adds-tls-1-3-support-in-firefox-49-developer-edition-505555.shtml
  5. ↑ Mozilla Foundation (US), https://blog.mozilla.org/theden/2011/12/01/10-reasons-to-upgrade-to-the-latest-firefox-version/
  6. ↑ http://www.pcworld.com/article/2013737/out-of-date-vulnerable-browsers-put-users-at-risk.html
  7. http://www.ghacks.net/2016/06/22/firefox-gets-tls-1-3-support/

About This Article

wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. To create this article, volunteer authors worked to edit and improve it over time. This article has been viewed 36,293 times.
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Co-authors: 3
Updated: March 29, 2019
Views: 36,293
Categories: Firefox | Internet Security
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