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Preview of Modify Headers DNR

Modify Headers DNR by Brawl

Modify request and response headers through the DeclarativeNetRequest API

Available on Firefox for Android™
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Screenshots
You can see the new header in the network console.
About this extension
You can set, append and remove various HTTP headers on both request and response. This add-on differs from others in that it uses the MV3-compatible "DeclarativeNetRequest" API which means that the browser itself handles all the modifying logic.

NOTE: Modified response headers won't be shown in the network console but they are still applied.
Developer comments
The full changelog is available on GitHub.
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Required permissions:

  • Block content on any page

Optional permissions:

  • Access your data for all websites

Data collection:

  • The developer says this extension doesn't require data collection.
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More information
Version
3.1.0
Size
77.48 KB
Last updated
5 days ago (Jun 10, 2026)
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