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:

filename	The name of the file that the stack frame takes place in.
lineNo	The line number is being executed at the stack frame.
funcName	The name of the function being executed at the stack frame, or null if the function is anonymous or the stack frame is being executed in a top-level script or module.

@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`. See [nsIException](https://developer.mozilla.org/en/NsIException) for more information. @function @returns {JSON} Returns the JSON representation of the stack at the point that this function is called. @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}