In Manifest v3

[Hames0024]

Your code is impossible in v3.
Right?

[ethanjerrum5]

@Hames0024 - This is something I'd like to know also, any update here please?

[markrosenbaum]

Unfortunately due to the Manifest V3 changes I don't believe the functionalities previously held by this extension are possible anymore. According to Google "Manifest V3 changes how extensions handle modification of network requests. Instead of intercepting network requests and altering them at runtime with chrome.webRequest, your extension specifies rules that describe actions to perform when a given set of conditions is met. Do this using the Declarative Net Request API."

[ethanjerrum5]

Thank you for the update @markrosenbaum