How can I debug a minified JS in firebug?

Question

I have a web page which includes insane amount of minified JS files. The web page works perfectly fine on my local network but throws some JS error on staging. There is

Answer 1

This is more a workaround, but it can help. The idea is that we will replace files coming from the server by files on your machine.
This will work with any browser.
It takes a bit of setup the first time (15 minutes maybe), but then it can be very convenient.
It can also helps testing your bug-fixes in a live/prod environment.

1. Get Fiddler (it's a web debugging proxy), install it, run it.
   http://www.fiddler2.com/fiddler2/
   (Restart browser after install to get the Fiddler extension)
2. If you debug an HTTPS website, check this first:
   http://www.fiddler2.com/Fiddler/help/httpsdecryption.asp
3. From now on, you should see in Fiddler ("Web Sessions" pane on the left) all downloads made by your browser, including JS files.
   If not, check this : Fiddler not displaying sessions
4. Find the file you want to debug in the list (Ctrl+F works)
5. Click on the file. Then either:
   • get the file content from the inspectors pane (textView tab), beautify it, save to a file on your local computer
   • or have access to a file which contains the source code (ex: from your source control)
6. Go to AutoResponder tab (top left pane).
   Select "Enable automatic responses" checkbox.
   Select "Unmatched requests passthrough" checkbox.
7. Drag your file from left pane to right pane (prefills rule editor at the bottom)
8. Set the other field with the path of your local file
9. Click the Save button
10. Reload the page and enjoy your debugging session.

Fiddler can do many more things, but this use-case answers the initial question.