Wikimedia Bugzilla is closed!

Steps to reproduce:
1. [[Special:Preferences]]: uncheck all Usability options (if not sure then uncheck everything)
2. http://en.wikipedia.org/w/index.php?title=WP:Sandbox&action=edit&useskin=vector : charinsert and the old toolbar don't work.

FireFox throws the error "context is null" probably on the line 
 hasIframe = context !== undefined && context.$iframe !== undefined;
because the first expression specifically check for "undefined" while "context" in this situation is actually "null".

Switching to other skin or adding any Usability option in preferences (like "Warn me when I leave") makes the problem disappear.

Could be the same as bug 24249