WebExtensions: webRequest.blockResponse with body response?

Add-ons Development
1

Hi.

I block the request of certain URLs and I want to respond with a custom HTML page. What’s the recommended way to do so?

browser.webRequest.onBeforeRequest.addListener(
  function(details){

// return HTML as well

 return { cancel: true};
},
  { urls: ["http://www.example.com/"] },
  ["blocking"]
);
2

You can try “Redirecting requests”

3

Any other way? Without changing document.location?

4

That will look like Phishing and not allowed.

5

I have a third party javascript library which only operates when the window.location property is set correctly. I want to seperate it from the page. At the moment I do cancel the request but modify the response. It would be nicer to cancel the request before it is done than modifying just the response.

6

Try the StreamFilter API, supported from Firefox 57.