[Navigator] Add a pref to allow the stop button to always be enabled

navigator/app/defaults/pref/navigator-prefs.inc.js

@@ -213,6 +213,11 @@ pref("browser.backspace_action", 0);
 // 2 - pre-populate site URL and pre-fetch certificate.
 pref("browser.ssl_override_behavior", 2);
 
+// Keep the stop button always active
+// The stop button WILL remain initally disabled until SOME navigation event
+// has occured since it lives in onStateChange.
+pref("browser.stopButton.alwaysEnabled", false);
+
 // if true, use full page zoom instead of text zoom
 pref("browser.zoom.full", true);
 

navigator/base/content/nsBrowserStatusHandler.js

@@ -256,7 +256,12 @@ nsBrowserStatusHandler.prototype =
 
       // XXX: These need to be based on window activity...
       // XXXjag: <command id="cmd_stop"/> ?
-      this.stopButton.disabled = true;
+      if (Services.prefs.getBoolPref("browser.stopButton.alwaysEnabled", false)) {
+        this.stopButton.disabled = false;
+      } else {
+        this.stopButton.disabled = true;
+      }
+
       this.stopMenu.setAttribute('disabled', 'true');
       this.stopContext.setAttribute('disabled', 'true');
     }