An interface for the additional object that's supplied in the BlockingResponse callback.
Details here: https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/webRequest/onBeforeRequest#details
An interface for the additional object that's supplied in the BlockingResponse callback.
Details here: https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/webRequest/onBeforeRequest#details