387897 - invalid 'instanceof' operand EVAL_SANDBOX.Array error when calling getSessionState() API function

Status: RESOLVED DUPLICATE of bug 387859

(Firefox :: Session Restore, defect)

Description

[Michael Kraft [:morac]]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a7pre) Gecko/2007071205 Minefield/3.0a7pre
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a7pre) Gecko/2007071205 Minefield/3.0a7pre

After upgrading to the latest nightly of Minefield I noticed that the Session Manager extension was not working.  I noticed the following error in the error console:

Error: invalid 'instanceof' operand EVAL_SANDBOX.Array
Source File: file:///C:/Program%20Files/Minefield/components/nsSessionStore.js
Line: 1923

This error occurs when any API function that calls the _toJSONString function in the nsSessionStore component is called, namely: getSessionState, getWindowState and getClosedTabData

This effectively breaks the nsSessionStore component's API in Firefox 3.0.

Reproducible: Always

Steps to Reproduce:
1. Install Session Manager (or any extension that uses the SessionStore API)
2. Try to save a session (or issue a call to getSessionState()) 

Actual Results:  
Error: invalid 'instanceof' operand EVAL_SANDBOX.Array
Source File: file:///C:/Program%20Files/Minefield/components/nsSessionStore.js
Line: 1923

Expected Results:  
Returns the session state.

This is a regression.