I’m currently migrating a browser extension from Manifest v2 to Manifest v3. Among other things, the extension creates an iFrame of the currently open page, but it blocks a specific script within the iFrame.

I was able to achieve this well in v2 by using chrome.webRequest.onBeforeRequest.addListener and checking if details.url.includes("abcd.js") && details.frameId !== 0 was true, and then blocking the request if the condition was met.

In Manifest v3, I need to somehow transfer this to declarative_net_request, but I can’t find a way that worked 🙁

Does anyone have an idea or even a solution?