problem opening new Fx windows when the web console is open

winxp or win7, Fx 13-15, new profile, httpfox 0.8.10

1. start Fx
2. open error console (show errors only)
3. open web console
3. open new Fx window

The window is visually messed up (differently on different oses).  On xp, it 
has two stacked title bars one and the lower one contains the Fx menu button.

The following errors are logged in the error console (multiple times):

Error: this.browsers[i] is undefined
Source File: chrome://browser/content/tabbrowser.xml
Line: 180

Error: this.browsers[i] is undefined
Source File: chrome://browser/content/tabbrowser.xml
Line: 325

Error: uncaught exception: [Exception... "Component returned failure code: 
0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIObserverService.addObserver]"  
nsresult: "0x80070057 (NS_ERROR_ILLEGAL_VALUE)"  location: "JS frame :: 
chrome://browser/content/browser.js :: prepareForStartup :: line 5065"  data: 
no]

In a new profile, despite the errors and visual problems, the window seems to 
navigable, but on a different profile with other extensions , it's not.

So there might be additional extension interaction issues, however the initial 
problem is caused by httpfox.

Original issue reported on code.google.com by meanlo...@gmail.com on 1 Jun 2012 at 11:23

wtest / httpfox

problem opening new Fx windows when the web console is open #119