Extended Support Release
In January 2012, the Mozilla Foundation announced the availability of an Extended Support Release version of Firefox.
Firefox ESR is intended for groups who deploy and maintain the desktop environment in large organizations such as universities and other schools, county or city governments and businesses. During the extended cycle, no new features will be added to a Firefox ESR; only high-risk/high-impact security vulnerabilities or major stability fixes will be corrected.
An Extended Support Release includes continuity of support through 9 normal Firefox rapid release cycles (54 weeks), with the final 2 cycles overlapping the next version. ESR versions will jump from 10 to 17, then to 24 etc.
Every six weeks when a new mainstream Firefox release is made under the rapid release cycle, a corresponding security update would also be released for the then-current ESR version. For example, ESR 10.0.1 would be expected to be released at the same time as Firefox 11, ESR 10.0.2 at the same time as Firefox 12. Security updates for ESR versions are also released when out-of-band security updates are made available for mainstream Firefox releases, for example ESR 10.0.10 corresponds with Firefox 16.0.2. At Firefox 17 and Firefox 18, there would be two ESR versions supported. Respectively, ESR 10.0.11 and ESR 17.0.0; ESR 10.0.12 and ESR 17.0.2. Finally, when Firefox reaches 19.0, ESR 10 would go end-of-life alongside the release of ESR 17.0.2. The cycle repeats again.
When ESR 10.0.x reaches end-of-life the automatic Firefox Updater will prompt users to update to ESR 17.0.x.
Read more about this topic: History Of Firefox
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