https://www.mozilla.org/en-US/firefox/43.0.2/releasenotes/
404: Page Not Found
追記
Fixed: Various stability and security fixes
Changed: Use a SHA-256 signing certificate for Windows builds, to meet new signing requirements
あらら
追記終わり
This has been added to the release notes with two wordings for 43.0.1 & 43.0.2 but also beta (only the second) and esr (38.5.1 & 38.5.2):
https://bugzilla.mozilla.org/show_bug.cgi?id=1079858
* Prepare to use SHA-256 signing certificate for Windows builds, to meet new signing requirement (1079858)
* Use a SHA-256 signing certificate for Windows builds, to meet new signing requirements
続 Firefox 43.0.1 の模様