Working fine on Firefox 30 Rated 5 out of 5 stars

Working fine on Firefox 30.0

Rated 1 out of 5 stars

Seems broken with Firefox 29 and its new [*cough*/*splutter*] UI. Can only get to the options page with is a modal dialog. Frustrating as amongst a wealth of developer tools built in to Firefox, simply being able to view the HTTP headers ought to be a given, and all searching leads here, to a [*expletive*] dead end.

[Review is based on Mozilla failing to maintain compatibility, such that an apparently invaluable add-on no logner works, though also a reflection that it has not apparently been maintained for several years, and the help link is broken.]

Super! Rated 5 out of 5 stars

Thank you so much for making this! Its has saved me tons of time and is a go-to debugging tool.

Expanded filter options would be great - but whatever - its already great.

Rated 5 out of 5 stars

Brutal add-on!

Copy options Rated 5 out of 5 stars

There should be an option to "Copy All". Right now, we need to "Select All", then "Copy".

Rated 5 out of 5 stars

One of the most useful essentials!

Rated 5 out of 5 stars

This addon is just great!! I found only one small problem, in most cases it does show the 301 and 302 redirects, but when a site redirects the same URL from HTTP to HTTPS it does not. I don't see the 301 or 302 headers, I only see a 200 OK response.

Rated 5 out of 5 stars

Sidebar. Real-time code. Awesome.

Rated 5 out of 5 stars

Un très bon module que nous utilisons tous les jours dans notre activité e-commerce. Idéal pour débugguer si vous faites du tracking Google Analytics.

Le plus : vous pouvez éditer et renvoyer une requête.
Le moins : vous ne pouvez pas intercepter une requête à la différence de Tamper Data.

Rated 5 out of 5 stars

Five stars for this awesomeness.

I tried a similar extension for Google Chrome, but only found something incredibly unstable with bad handling on top of it. Only Opera included a HTTP header sniffer in its Dragonfly developer utility, but since that version of the browser won't receive any updates anymore, Live HTTP headers looks to be the only solution that works conveniently from within a browser.

Great stuff, I'll start using it more and more in the future as I phase the old Opera out.

Sneaky Rated 5 out of 5 stars

I love this extension. It is great for debugging websites and setting what headers are specifically being sent and received. It is also useful to spy on various extensions and see how often they "phone home" or are working the way they are designed to.

Lifesaver! Rated 5 out of 5 stars

- Save entire request/response transaction to a file.
- Integration with "Page Info" window.
- You can turn off capturing and turn on when you want.

- Header Generator is a little confusing.
- Doesn't bring dinosaurs back.

replay bug Rated 5 out of 5 stars

For those who didn't notice, last FF update (18) broke the addon (not the other way around). Just tried using FF 19 beta and addon works well with it, so just use the beta or wait for a stable new release :)
(and removing http and https doesn't solve the issue as we don't get a 400 error, but the custom headers are ignored anyway) Awesome addon btw (installed on my FF since first release)

fix the problem when you try to replay Rated 5 out of 5 stars

the curent version of the tool 0.17 fail to replay with some web pages, and the problem is in the url .
to fix it just remove the protocal[http://,https:// ...] from the reqeust in the replay window . ^_^ have fun

FireFox18 Rated 5 out of 5 stars

this addon not working well with ff18,while replaying a request it failed to add host,useragent,accept,cookie headers in the request ,as a result from the server HTTP CODE 400 Bad Request.
developers please update the addon

Firefox 16.1 Rated 4 out of 5 stars

I love this tool - so handy. However, I've recently moved from Windows XP to Windows 7, and also upgraded to Firefox 16.1. Not sure whether I'm just being stupid or if there really is no link for Live HTTP Headers from the Firefox menu. Would really like to open this up as a new tab.

Rated 5 out of 5 stars

Excellent tool. Many thanks.

Rated 5 out of 5 stars

its great addon and its still working. I hope it will be still updated.

A little annoying bug? Rated 4 out of 5 stars

When I request a directory from a server without ending / the server redirects (http status code 301) me to the same named location with an ending /
eg.: host/dir ==> host/dir/
This 301 redirection headers (and maybe others) does not appear in the headers tab by default but shows up when the request is edited (after clicking the appropriate button) and re-executed...

Great for me! Rated 5 out of 5 stars

Love it for SSO implementations, whether it's through a portal or homegrown.

This user has a previous review of this add-on.