Whoismon is a browser extension for Firefox, Safari, and Chrome that can be used to monitor all the HTTP requests that your browser creates, including where they come from, what they are for, and how long they last. It supports Google Chrome and Mozilla Firefox. The extension has an overview of the active requests, and you can click on any of them to see a detailed log of the request.

It also monitors for other events that can happen on your computer, such as virus infection, and informs you of any potentially dangerous activity.

Note that this extension is not a permanent part of your browser, but can be added and removed at any time. You will not be asked for permission to use the functionality described above.