Releases
From MozillaWiki
Current Release
Firefox release notes.
Firefox ESR current release notes.
Thunderbird current release notes.
SeaMonkey current release notes.
Upcoming Releases
Upcoming release dates are listed at RapidRelease/Calendar.
Past Releases
The full list of Firefox release notes is available on mozilla.org.
The full list of Thunderbird release notes is available on mozilla.org.
Archive of 2001–2015 releases by date.