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Current Release

Firefox release notes.
Firefox ESR current release notes.

Thunderbird current release notes.
SeaMonkey current release notes.

Upcoming Releases

Upcoming Firefox release dates are listed at RapidRelease/Calendar.
Thunderbird approximately (i.e. not strictly) follows the ESR schedule listed there.

Past Releases

The full list of Firefox release notes is available on
The full list of Thunderbird release notes is available on Old releases can be found at releases directory.

Archive of 2001–2015 releases by date.