TLDR
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Developer prototypes matrix³, an MV3 Chrome extension replacing uMatrix using declarativeNetRequest and Content Security Policy injection.
Key Takeaways
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uMatrix was deprecated because uBlock Origin covered its feature set; uBO Lite (MV3) dropped the advanced request-blocking capability entirely.
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MV3 removes blocking webRequest callbacks, but declarativeNetRequest rules are flexible enough to replicate uMatrix-style subresource control.
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The design injects custom Content-Security-Policy headers via declarativeNetRequest, offloading enforcement to the browser.
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CSP’s report-to directive feeds violation reports back to the extension, populating the allow/deny list without a persistent background script.
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matrix³ is a dependency-free prototype: git clone and Load Unpacked in Chrome.
Hacker News Comment Review
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