Exposing chrome JS objects to content without __exposedProps__ is insecure and deprecated. See https://developer.mozilla.org/en/XPConnect_wrappers for more information.

If you receive an error in FireFox like this:

Exposing chrome JS objects to content without __exposedProps__ is insecure and deprecated. See https://developer.mozilla.org/en/XPConnect_wrappers for more information.

It is most likely a problem with a plugin or 3^rd party JS file. The file/plugin in question needs to be updated to stop this error from happening. See:

https://blog.mozilla.org/addons/2012/08/20/exposing-objects-to-content-safely

https://bugzilla.mozilla.org/show_bug.cgi?id=553102

Hope this helps.

Shane