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<!-- contributed by Atul Varma [atul@mozilla.com] -->
<!-- edited by Noelle Murata [fiveinchpixie@gmail.com] -->
The `traceback` module contains functionality similar to
Python's [traceback](http://docs.python.org/library/traceback.html) module.
## JSON Traceback Objects ##
Tracebacks are stored in JSON format. The stack is represented as an
array in which the most recent stack frame is the last element; each
element thus represents a stack frame and has the following keys:
<table>
<tr>
<td><code>filename</code></td>
<td>The name of the file that the stack frame takes place in.</td>
</tr>
<tr>
<td><code>lineNo</code></td>
<td>The line number is being executed at the stack frame.</td>
</tr>
<tr>
<td><code>funcName</code></td>
<td>The name of the function being executed at the stack frame, or
<code>null</code> if the function is anonymous or the stack frame is
being executed in a top-level script or module.</td>
</tr>
</table>
<api name="fromException">
@function
Attempts to extract the traceback from *`exception`*.
@returns {traceback}
JSON representation of the traceback or `null` if not found.
@param exception {exception}
exception where exception is an `nsIException`.
</api>
See [nsIException](https://developer.mozilla.org/en/NsIException) for more
information.
<api name="get">
@function
@returns {JSON}
Returns the JSON representation of the stack at the point that this
function is called.
</api>
<api name="format">
@function
Given a JSON representation of the stack or an exception instance,
returns a formatted plain text representation of it, similar to
Python's formatted stack tracebacks. If no argument is provided, the
stack at the point this function is called is used.
@param [tbOrException] {object}
</api>
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