Firefox addon to see the request

Is it possible to see the request which my browser send to the serve开发者_Python百科r. Or if it's some addon for firefox.

Firebug for firefox or fiddler standalone

webdeveloper addon
install it and in the "forms" tab see the "convert form methods".
Download it from : https://addons.mozilla.org/en-US/firefox/addon/60/

All the answers given so far are good, but I really like HttpFox, personally.

You can check Live HTTP Headers

I just use the Web Developer Tools in Firefox. You can easily view the request using Web Console (Ctrl+Shift+K)

In addition, if you are interested in exploring the effects of various headers, such as say you are interested to tamper with/ block those requests, you may have a look at the firefox extension Tamper Data.