Handle multiple bridge instances within navigator interface

[brianhall]

Asana Task/Github Issue: https://app.asana.com/1/137249556945/task/1210888277209380?focus=true

Description

Lets C-S-S handle message bridge instances.

Testing Steps

TBD

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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[github-actions]

Temporary Branch Update

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

• Branch Name: pr-releases/pr-1848
• Commit Hash: 69639901d4916a54b199e35734bdc5ba21fc3ad0
• Last Updated: July 29, 2025 at 5:15:24 PM UTC
• Install Command: npm i github:duckduckgo/content-scope-scripts#69639901d4916a54b199e35734bdc5ba21fc3ad0

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

[github-actions]

[Beta] Generated file diff

Time updated: Tue, 29 Jul 2025 17:15:49 GMT

Android

    - android/contentScope.js

File has changed

Apple

    - apple/contentScope.js

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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

[brianhall]

Ready for review, gents. Thank you!