By default, Firefox ESR v52.9.0 supports TLS 1.1 and TLS 1.2 protocols for connecting to secure https sites, and I've added the latest TLS 1.3 support to my own Firefox ESR v52.9.0 browser (i.e., by changing to a value of 4 in the advanced settings) as instructed in Martin Brinkmann's June 2017 article How to Enable TLS 1.3 Support in Firefox and Chrome. Have you tried playing your YouTube video with Firefox ESR v52.9.0? I ran a comparison of Firefox v52 with Firefox v82.0.2 (the current default browser on my Win 10 machine) on the HTML5Test site at HTML5test - How well does your browser support HTML5? and they both support the same video codecs, including H.264.įull offline installers (all regions and languages) for Firefox ESR v52.9.0 are available for download from Mozilla's FTP server at Directory Listing: /pub/firefox/releases/52.9.0esr/win32/ if you want the English-US installer (Firefox Setup 52.9.0esr.exe), for example, choose the /EN-US subfolder.
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