Autocomplete Ctrl-Space shortcut conflict with Old Firefox

There is a conflict on Ctrl-Space shortcut with Firefox older versions(I have 28).
Does anyone have a workaround for it ?

I have tried below two, without any success.

a.      
           this.editor = CodeMirror.fromTextArea(el, this.options);
	   this.editor.on('onkeypress', function(cm, event) {
			if (event.keyCode == 32 && event.ctrlKey) {				
				self.server.complete(cm, self.server);
				event.stopImmediatePropagation();
				event.stopPropagation();				
			}
		});
b.   http://jsfiddle.net/g3toraf7/22/
      document.addEventListener("keydown", function(e) {
     if (e.keyCode == 32 && (e.ctrlKey)) {
        alert("test");
        e.stopImmediatePropagation();
        e.stopPropagation();      
    }
    }, false);

Here is the Firefox bug
https://bugzilla.mozilla.org/show_bug.cgi?id=435164
After going through this pain, figured latest Firefox 38 removed the shortcut.

Regards
Kalyan

I looked into this at one time as well, and concluded that no, there is no workaround. You can use a different key combination, or provide an alternative combination for Firefox users.