Ensure event hooking does not break window-level listeners.

Author: hackademix

src/content/eventsHook.main.js

@@ -25,7 +25,7 @@ if (location.protocol == "file:") {
 
   function modifyWindow(scope, {port, xray}) {
     const { window } = xray;
-    const { Proxy, document } = window;
+    const { Proxy, document, Node } = window;
 
     const { Reflect } = globalThis;
 
@@ -46,7 +46,7 @@ if (location.protocol == "file:") {
     const call = (func, obj, ...args) => Reflect.apply(func, obj, args || NO_ARGS);
 
     const watch = watching => {
-      if (!watchList.has(watching)) {
+      if (watching instanceof Node && !watchList.has(watching)) {
         const ownerDocument =  call(nodeProps.ownerDocument, watching);
         const crossDoc = ownerDocument != document;
         const parentNode = call(nodeProps.parentNode, watching);
@@ -125,4 +125,4 @@ if (location.protocol == "file:") {
     onMessage: m => {
     },
   });
-}
+}