Netmon - Network monitor for in Firefox / Chrome
About
Network monitor - shows requests and responses, including the HTTP headers, of the current page, or globally. It is possible to use it at any time, also after the page has loaded. This is useful when there are random errors in some cases and we just want to see what happened, see a list of the past requests. It also displays request count in current tab.
Installing
Firefox
The extension is listed on addons.mozilla.org
Chrome
The extension is listed on Chrome Web Store