[DRAFT] Add Windows client hint brands override to match header we override natively

[laghee]

Asana Task/Github Issue: https://app.asana.com/1/137249556945/project/72649045549333/task/1208581002806545?focus=true

Description

Adding an override for our client hints brands in the JS API to match those we send in the Sec-CH-UA header and resolve breakage caused by current inconsistency between the two.

Testing Steps

Privacy test page TODO

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

Introduce uaChBrands to override navigator.userAgentData.brands (preserving GREASE) and add Windows integration tests and pages.

• Feature: uaChBrands
  • Implement injected/src/features/ua-ch-brands.js to override navigator.userAgentData.brands and align with configured settings.brands.
  • Preserves GREASE brand and position; updates getHighEntropyValues(['brands']) to return overridden values; caches original/mutated brands.
  • Register in injected/src/features.js (otherFeatures, platformSupport.windows).
• Tests
  • Add Playwright spec injected/integration-test/ua-ch-brands.spec.js.
  • Add test pages/configs under injected/integration-test/test-pages/ua-ch-brands/ for brand override and missing-brands scenarios.
  • Include spec in injected/playwright.config.js for Windows project.

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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-2028
• Commit Hash: f34dee3fbd140ae321c1c0b8c7ce426345743741
• Last Updated: November 3, 2025 at 5:47:20 PM UTC
• Install Command: npm i github:duckduckgo/content-scope-scripts#f34dee3fbd140ae321c1c0b8c7ce426345743741

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

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[Beta] Generated file diff

Time updated: Mon, 03 Nov 2025 17:48:13 GMT

Android

    - android/adsjsContentScope.js

• android/autofillImport.js
• android/brokerProtection.js
• android/contentScope.js

File has changed

Apple

    - apple/contentScope.js

• apple/contentScopeIsolated.js

File has changed

Chrome-mv3

    - chrome-mv3/inject.js

File has changed

Firefox

    - firefox/inject.js

File has changed

Integration

    - integration/contentScope.js

File has changed

Windows

    - windows/contentScope.js

File has changed