LiveHTTPHeaders
8th April 2003
Via Sam Buchanan, Daniel Savard’s incredibly useful LiveHTTPHeaders addon for Mozilla and Phoenix. It adds an extra tab to the Page Info dialog with the full HTTP headers sent with the page, and also adds a HTTP Headers tool to the Tools menu which can be used to watch and debug HTTP requests in real time. I wish I’d known about this when I was developing HttpClient.
Incidentally, check out the headers on Slashdot for a particularly geeky in-joke ;)
More recent articles
- New prompt injection papers: Agents Rule of Two and The Attacker Moves Second - 2nd November 2025
 - Hacking the WiFi-enabled color screen GitHub Universe conference badge - 28th October 2025
 - Video: Building a tool to copy-paste share terminal sessions using Claude Code for web - 23rd October 2025