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Release Management/ESR Landing Process

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Goal: We'd like to have a lightweight process that prevents "surprise" ESR landings at the 11th hour and makes sure ESR patches are created very soon after their related mainline patches

The ESR repo:

More info about the ESR: and

What should land on mozilla-esr24: Security and some major stability fixes when they're landed/merged onto mozilla-beta, or fixes for regressions specific to the ESR

The associated flags:


  •  ?
  • +
  • -


  •  ?
  • -
  • 11+
  • 12+
  • 13+
  • ...


  •  ?
  • unaffected
  • wontfix
  • affected
  • checkin-pending
  • fixed
  • verified

The process:

1) When an engineer believes that a stability bug needs to be addressed for the ESR, or a security fix that's landed on a branch affects the ESR:

  • Set tracking-esr24 to ?
  • Set status-esr24 to affected if an ESR patch is still being worked on
  • Set approval-mozilla-esr24 to ? and status-esr24 checkin-pending if a patch is ready to land on mozilla-esr24

2) Members of both Security and Release Management teams will triage tracking-esr24=?, and if agreement is that it's needed for the ESR, the tracking flag will be set to the first version of mainline Firefox that the patch is present in and the approval-mozilla-esr24 flag will be set to +.

  • In the case of an ESR-specific regression, we'll track for the next ESR release.
  • Why are we using mainline versions to track the ESR? According to the ESR proposal, a chemspill uses a minor version number, thus throwing off our tracking flags. Additionally, engineers shouldn't have to know what version of the ESR we're on.

3) Once the mozilla-beta version matches the tracking-esr24 version, Security and Release Management teams will triage those bugs and make sure affected/checkin-pending fixes are landed at least 1 week prior to release so that we can go-to-build.

  • Approval is required, so add "a={whoever set the approval-mozilla-esr10 flag to +}" to the commit message.
  • After landing the patch, set status-esr24 to "fixed".
  • Our beta period for the ESR will be to push this build to FTP a week early for qualification by enterprises.


ESR Triage Queries



NOTE: Post-merge, we'll likely need to create new static links for 20+ b2g bugs (still landing to v1.1, along with 21+ bugs)