https://www.mozilla.org/en-US/firefox/71.0/releasenotes/
Security Vulnerabilities fixed in - Firefox 71 - Mozilla Foundation Security Advisory 2019-36
追記
「Firefox 71」が正式リリース ~Windows版で動画のピクチャーインピクチャー再生が可能に - 窓の杜
追記終わり
Android 版も Firefox 68.3.0
https://www.mozilla.org/en-US/firefox/android/68.3.0/releasenotes/
Security Vulnerabilities fixed in - Firefox ESR 68.3 - Mozilla Foundation Security Advisory 2019-37