How does http sniffer work in browser(HttpFox,HttpRequester,FireBug)?

Question

JavaScript

Tell me how such extensions as HttpFox HttpRequester FireBug work, they work like a regular sniffer and each tab is allowed through a separate stream, or information about all requests for each tab can be pulled out through the browser api.

Answer 1

> let each tab through a separate stream
What other streams in browser JS? Haven't heard of this.
And what do they "let" there?
And there is no direct connection with the tabs here, are we living in Web 1.0 when 1 tab = 1 request, and no Ajaxes, not even frames and the img tag (which is generally impossible to imagine - frames and img were already in Web 1.0) - haven't been invented yet?
But in the browser API there are some means for intercepting all requests, it may well be possible to determine the nature of the request (frame, img, XmlHttpRequest (AJAX), or maybe it’s a request from another extension), and which tab one way or another it gave birth.
Especially in Firefox it should be rich.
> how these extensions
work It sucks they work.
Maybe they can capture everything they need, but the captured is displayed very inconveniently, the devil will break his leg, you can’t make out anything.
And if you need to sniff requests not from the site at all, but from the Android application, say?
With the advent of Fiddler, all this was no longer necessary.