Live HTTP headers Firefox extension

I recently needed a tool that would enable me to view all http requests issued by the Web page loaded in my browser — in order to figure out what files were being requested and from which location. For those of you in a similar situation, I strongly recommend the LiveHTTPHeaders Firefox extension.

The tool is great, works on multiple platforms, and gets around needing to install and configure a packet sniffer in order to gain this type of information.

As described on the LiveHTTPHeaders project Web site:

The goal of this project is to adds information about the HTTP headers in two ways:

• First by adding a ‘Headers’ tab in ‘View Page Info’ of a web page.
• Second by adding a tool in the ‘Tools->Web Development’ menu to be able to display http headers in real time (while pages are being downloaded from the Internet.
• Third by letting you edit request headers and replay an URL (beta). Look for the Replay button in the live window!

This project may be of some help for the following:

• Help debugging web application.
• See which kind of web server the remote site is using.
• See the cookies sent by remote site.