2051853 - 0.17% installer size () regression on Tue June 23 2026

Status: RESOLVED WONTFIX

(Firefox :: Shell Integration, defect)

Description

[Treeherder Bug Filer]

Perfherder has detected a build_metrics performance regression from push 942ec841badc4e3e0063c71046be88a402e95af8. As author of one of the patches included in that push, we need your help to address this regression.

Please acknowledge, and begin investigating this alert within 3 business days, or the patch(es) may be backed out in accordance with our regression policy.

Regression	Test	Platform	Options	Absolute values [old vs new]
0.17%	installer size	win64-nightlyasrelease	nightly nightly-as-release	135,356,820.96 -> 135,588,465.08

Support & Actionable Steps

For questions, please contact [e-mail]. You can also find help on Slack (#perf-help) or Matrix (#perftest).

Action guide details:

• See the guide to handling regression bugs for investigation steps.
• Review the alert summary for affected tests, graphs, and comparisons.
• Check the PerfCompare results.
• Tests on Try: Run all tests using ./mach try perf --alert 51095 (See documentation link for details).
• Profiling jobs: Trigger jobs from Treeherder job view or request them from [e-mail].

Comment 1

[BugBot [:suhaib / :marco]]

Set release status flags based on info from the regressing bug 2043423

Comment 2

[Mike Conley (:mconley) (:⚙️)]

This is very intentional / expected. We're adding a new bundled image to the firefox.exe binary. We'll be adding more in bug 2049877.