Get expanded performance results

[jonathanKingston]

Asana Task/Github Issue: https://app.asana.com/1/137249556945/project/414235014887631/task/1211309170962125?focus=true

Description

• Adds a expanded parameters to breakage reports
• Adds a new message sent on page load expandedPerformanceMetricsResult

Testing Steps

• In the apple repos we should listen for expandedPerformanceMetricsResult
• To use this repo:
  • Change the npm branch to this one: npm i github:duckduckgo/content-scope-scripts#ff164dd9bc074de381a48c28115728ff5ddb3ba3 (this will update below in the comment if we push more).
  • Call npm run build-content-scope-scripts in the apple repo.

Checklist

Please tick all that apply:

• I have tested this change locally
• I have tested this change locally in all supported browsers
• This change will be visible to users
• I have added automated tests that cover this change
• I have ensured the change is gated by config
• This change was covered by a ship review
• This change was covered by a tech design
• Any dependent config has been merged

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Note

Adds expanded performance metrics (LCP, navigation, sizes, etc.) collection and messaging, gated by feature flags and included in breakage reports when enabled.

• Utilities (injected/src/features/breakage-reporting/utils.js):
  • New: getExpandedPerformanceMetrics with error handling; gathers navigation timings, paint (incl. FCP), awaits LCP, network timings, sizes, resource stats, and metadata.
  • Helper: waitForLCP to observe largest-contentful-paint with timeout.
• Features:
  • PerformanceMetrics (injected/src/features/performance-metrics.js):
    • Emits expanded metrics on page load via expandedPerformanceMetricsResult when expandedPerformanceMetricsOnLoad is enabled; skips when isBeingFramed().
  • BreakageReporting (injected/src/features/breakage-reporting.js):
    • Conditionally appends expandedPerformanceMetrics to breakageReportResult when expandedPerformanceMetrics is enabled.

^{Written by Cursor Bugbot for commit f3f4fa8. This will update automatically on new commits. Configure here.}

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[github-actions]

Temporary Branch Update

The temporary branch has been updated with the latest changes. Below are the details:

• Branch Name: pr-releases/pr-1989
• Commit Hash: 025a125f21192b55495cd27b1648239bb1eb9d4e
• Last Updated: October 2, 2025 at 10:28:38 PM UTC
• Install Command: npm i github:duckduckgo/content-scope-scripts#025a125f21192b55495cd27b1648239bb1eb9d4e

Please use the above install command to update to the latest version.

[github-actions]

[Beta] Generated file diff

Time updated: Thu, 02 Oct 2025 22:28:50 GMT

Android

    - android/adsjsContentScope.js

• android/contentScope.js

File has changed

Apple

    - apple/contentScopeIsolated.js

File has changed

Integration

    - integration/contentScope.js

File has changed

Windows

    - windows/contentScope.js

File has changed