Log chrome webRequest and webNavigation events for blob URLs

log-blob.js

function logEvent(type, details)
{
  if (details.url.startsWith("blob"))
    console.log(type, details);
}

/* WebNavigation */
chrome.webNavigation.onBeforeNavigate.addListener(details =>
{
  logEvent("onBeforeNavigate", details);
});

chrome.webNavigation.onCommitted.addListener(details =>
{
  logEvent("onCommitted", details);
});

chrome.webNavigation.onDOMContentLoaded.addListener(details =>
{
  logEvent("onDOMContentLoaded", details);
});

chrome.webNavigation.onCompleted.addListener(details =>
{
  logEvent("onCompleted", details);
});


/* WebRequest */
chrome.webRequest.onBeforeRequest.addListener(details =>
{
  logEvent("onBeforeRequest", details);
}, {urls: ["<all_urls>"]}, ["blocking", "requestBody"]);

chrome.webRequest.onBeforeSendHeaders.addListener(details =>
{
  logEvent("onBeforeSendHeaders", details);
}, {urls: ["<all_urls>"]}, ["blocking", "requestHeaders"]);

chrome.webRequest.onSendHeaders.addListener(details =>
{
  logEvent("onSendHeaders", details);
}, {urls: ["<all_urls>"]}, ["requestHeaders"]);

chrome.webRequest.onHeadersReceived.addListener(details =>
{
  logEvent("onHeadersReceived", details);
}, {urls: ["<all_urls>"]}, ["blocking", "responseHeaders"]);

chrome.webRequest.onResponseStarted.addListener(details =>
{
  logEvent("onResponseStarted", details);
}, {urls: ["<all_urls>"]}, ["responseHeaders"]);

chrome.webRequest.onBeforeRedirect.addListener(details =>
{
  logEvent("onBeforeRedirect", details);
}, {urls: ["<all_urls>"]}, ["responseHeaders"]);

chrome.webRequest.onCompleted.addListener(details =>
{
  logEvent("onCompleted", details);
}, {urls: ["<all_urls>"]}, ["responseHeaders"]);

TL;DR - Sorry, doesn't work. Theoretically possible, but only with the scripting API, as far as I can tell.

As per Chromium issue 41406885, blob: URIs cannot be intercepted by webRequest. Having been trying to do the same thing in my own extension, webRequest, declarativeNetRequest, even debugger doesn't seem to be able to intercept them. Thus, I don't believe it's possible without injecting a script into every tab and overriding every method of producing a blob, which I will also be attempting. It's worth noting that I haven't tried using webNavigation, but I highly doubt it would have much success, either.