Improvement for 'beforeunload' event, bind the event only from where it is required.

web/pgadmin/tools/debugger/static/js/direct.js

@@ -1572,6 +1572,8 @@ define([
         });
       this.panels = [];
 
+      pgBrowser.bind_beforeunload();
+
       // Below code will be executed for indirect debugging
       // indirect debugging - 0  and for direct debugging - 1
       if (trans_id != undefined && !debug_type) {

web/pgadmin/tools/sqleditor/static/js/sqleditor.js

@@ -552,6 +552,8 @@ define('tools.querytool', [
         };
       });
 
+      pgBrowser.bind_beforeunload();
+
       /* If the screen width is small and we hover over the Explain Options,
         * the submenu goes behind the screen on the right side.
         * Below logic will make it appear on the left.