Simon Wilson recently blogged about a Firefox extension named Tamper Data. Like Wilson, I seldom need to play around with data submitted from the browser. However, the request/response display looks very handy and the graphing feature Wilson highlighted is golden. I could have really used this in my last job instead of resorting to Ethereal.
If you need this feature set, check out the screen shots at Wilson's blog: http://simon.incutio.com/archive/2006/10/17/graph. Tamper Data might scratch that itch.
