Rated 5 out of 5 stars

Thanks for your extension. But please update it for FF4.0 (in install.rdf :) ).

This review is for a previous version of the add-on (1.1). 

Support for FF4

XPCOMViewer 1.2 is updated for the latest Firefox.

Great tool, with a nasty bug :P Rated 4 out of 5 stars

This tool is a must-have for any FF extension developer.
Unfortunately it manages to break page layout on FF 3.0.

Here is how to fix it.

Go to Firefox Profile directory.

Locate extensions/xpcomviewer@ondrejd.com/chrome/xpcomviewer.jar

Uncompress it (using zip) to a temporary folder.

Edit content/xv.js and comment out or delete the following block:

// ==========
// XXX Only for debugging. Comment this in release version!!!
try {
var _prefs = Components.classes ["@mozilla.org/preferences-service;1"].
getService(Components.interfaces.nsIPrefService).
getBranch("");
_prefs.setBoolPref("browser.dom.window.dump.enabled", true);
_prefs.setBoolPref("javascript.options.showInConsole", true);
_prefs.setBoolPref("javascript.options.strict", true);
_prefs.setBoolPref("nglayout.debug.enable_xbl_forms", true);
_prefs.setBoolPref("nglayout.debug.disable_xul_cache", true);
_prefs.setBoolPref("nglayout.debug.disable_xul_fastload", true);
} catch(e) {}
// ==========

Re-compress your changes to xpcomviewer.jar

Also You want to remove the preferences set by this code
from Your prefs.js or by using about:config

Good luck!

This review is for a previous version of the add-on (0.9a). 

Rated 5 out of 5 stars

cool 8)

This review is for a previous version of the add-on (0.9a). 

Left over prefs break all page layout Rated 3 out of 5 stars

After you uninstall the extension the following prefs remain changed:
nglayout.debug.enable_xbl_forms
nglayout.debug.disable_xul_cache
nglayout.debug.disable_xul_fastload

1 or all of them is causing all websites to look messed up (like plexos also mentioned).

Resetting the prefs (to false) fixes the issues. Also javascript.options.strict stays set to true which might not be desirable.

Don't have time right now to figure out the why, that's up to you to figure out ;)

This review is for a previous version of the add-on (0.9a). 

Rated 5 out of 5 stars

Very good extension. Highly useful for my extension development, even if just to make sure the XPCOM is registered correctly. Works under Minefield 3.1

This review is for a previous version of the add-on (0.9a). 

Rated 1 out of 5 stars

This extension caused my online banking drop down forms to be unusable. I had to uninstall Firefox with the option to also remove prefs and extensions selected to fix the problem.

This review is for a previous version of the add-on (0.9a).