https://www.mozilla.org/ja/firefox/new/
https://www.mozilla.org/en-US/firefox/66.0.2/releasenotes/
https://www.mozilla.org/en-US/firefox/android/66.0.2/releasenotes/
https://www.mozilla.org/en-US/security/advisories/
Security Advisories は 66.0.1 まで
Android 版もようやく更新