If bug 309547 ever got fixed, that would make it trivial for an extension to restore the loading mouse pointer, since it could just force it on in response to the same event that turns the throbber on and off.
If bug 309547 ever got fixed, that would make it trivial for an extension to restore the loading mouse pointer, since it could just force it on in response to the same event that turns the throbber on and off.