I built this tool because I had a lot of production issues where I needed to make some changes and test them. I couldn't use devtools' Elements or Sources panel since I had to make this changes available as the page loads (inline script changes, css url changes, etc...).

I tried using Fiddler and similar alternatives (Charles, Burp), but:

1. When running it on the Mac you need to run a VM.

2. Fiddler shows you ALL the requests made by you're machine.

3. Moving between Fiddler, Chrome and Sublime is just annoying.

Since it's running a proxy server (it's actually based on http://www.mitmproxy.org) on your machine, it's also very useful when you want to test things on mobile devices.

Since Fiddler is just a proxy listening on port 8888, you can use some proxy profile extension like SwitchySharp in Chrome to control it, make only necessary urls access through fiddler.

This seems like a really great tool, but it doesn't appear to to work on Linux.

The background of that pages makes my screen look dirty. Even though I know it's the background every time my eyes move I see new dust on my screen :)

I was hoping this would be a more modern Tamper Data [1] but it sounds like you can't edit requests before they are sent?

[1]: https://addons.mozilla.org/en-US/firefox/addon/tamper-data/

Interesting idea. There is also a similar tool over here: https://suite.websecurify.com/market/httpview

I wouldn't try installing this on OSX until the pip install process is fixed, I wasted an hour trying to get it to work to no avail.

this broke the shit out of my pip install until I nuked all the stuff that got dropped in my /usr/local/lib/python2.7 directory. (linuxmint 14)

Also these instructions don't work straight away on linuxmint 14. I suspect some missing deps or incompatible versions or something.

Just FYI.

I'm sure the tool is awesome though! =)

I am already behind my institute proxy. Does it have a cascading feature ??

Currently you cannot chain proxies to Tamper. I will add this to my to do list.

If this helps, know that Tamper sets Chrome proxy settings to go through its proxy using a PAC file. You can modify that PAC file by clicking the little cog icon in Tamper.

Sweet, I was looking for something like this just last week.

There's a typo in the title, somebody please s/extenstion/extension/. Thanks.