To log app requests? Firefox doesn't have a proxy unless I'm mistaken.

There are at least three addons that allow viewing network activity with Firefox:

https://getfirebug.com/ http://chrispederick.com/work/web-developer/ https://addons.mozilla.org/en-US/firefox/addon/live-http-hea...

I haven't tried it but I expect the developer edition does too:

https://www.mozilla.org/firefox/developer/

But is there any way to use those to inspect traffic originating from outside of Firefox? With mitmproxy (or other tools, such as Charles/Fiddler/etc) you can run pretty much anything through them.

I would just use wireshark for that.

And so we're back to the original article. How do you deal with encrypted connections?