Mozilla has officially announced the schedule viacutting of Flash. The company along with many others will stop supporting Flash in January 2021.
84's version Firefox will be the final version to support Flash. On January 26, 2021, Firefox 85 is expected to be released, and It will be a version without Flash support, "improving our performance and security", according with the company.
As for them users following on the Nightly and Beta release channels, Flash support ends today, November 17, 2020 on Nightly and December 14, 2020 for the Beta channel.
There will be no setting to reactivate Flash support.
If Microsoft follows through on its plan to remove Flash, it will stop in Edge Beta on December 7, 2020, and in Stable on January 21, 2021. On the channel Canary support has already stopped.
Adobe will stop distributing and updating it Flash Player after 31 December 2020.
Adobe Flash is now the only NPAPI plug-in Firefox supports. The preletterChromium-based browsers will also drop Flash support starting with Chromium version 88 which will be released in January 2021.