I have a greasemonkey user script with this single line of code...
window.close();
but firefox does not allow a user script to close a window (as reported by an error message in the error console)
Is there a work around to this problem?
You need to change configuration settings of Firefox (about:config) to allow this.
Now your script can close the TAB with 'window.close()'
eg.
function closeTab(){
window.open('', '_self', '');
window.close();
}