Mozilla is going to temporarily re-enable the TLS 1.0/1.1 support in Firefox 74 and 75 Beta. The preference change will be remotely applied to Firefox 74, which has already been released to stable version users. 
The reason behind this change is the ongoing Coronavirus crisis, which made plenty of people work from home. Many may rely on online tools and various web sites that still don’t support TLS 1.2 yet. For the same reason, Google and Microsoft have postponed their browser releases.
The change will be delivered automatically, you do not need to do anything to get it.
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