https://support.zoom.us/hc/en-us/articles/201361953-New-Updates-for-Windows December 21, 2020 version 5.4.7 (59784.1220) Download type: Manual だけどなぁ アップデートを確認で自動更新

https://www.mozilla.org/en-US/firefox/84.0.1/releasenotes/ Fixed crashes caused by various third-party antivirus software. カスペはセーフだったっぽい