Issue 5599 - ext needs to be defined in the postload script

lib/composer.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 461 matching lines @@
   }
   unhighlightElements();
 
   let overlays = document.getElementsByClassName("__adblockplus__overlay");
   while (overlays.length > 0)
     overlays[0].parentNode.removeChild(overlays[0]);
 
   ext.onExtensionUnloaded.removeListener(deactivateBlockElement);
 }
 
-if (document instanceof HTMLDocument)
-{
-  // Use a contextmenu handler to save the last element the user right-clicked
-  // on. To make things easier, we actually save the DOM event. We have to do
-  // this because the contextMenu API only provides a URL, not the actual DOM
-  // element.
-  //   We also need to make sure that the previous right click event,
-  // if there is one, is removed. We don't know which frame it is in so we must
-  // send a message to the other frames to clear their old right click events.
-  document.addEventListener("contextmenu", event =>
-  {
-    lastRightClickEvent = event;
-    lastRightClickEventIsMostRecent = true;
-
-    ext.backgroundPage.sendMessage({
-      type: "forward",
-      payload:
-      {
-        type: "composer.content.clearPreviousRightClickEvent"
+function setupComposer()
+{
+  if (document instanceof HTMLDocument)
+  {
+    // Use a contextmenu handler to save the last element the user right-clicked
+    // on. To make things easier, we actually save the DOM event. We have to do
+    // this because the contextMenu API only provides a URL, not the actual DOM
+    // element.
+    //   We also need to make sure that the previous right click event,
+    // if there is one, is removed. We don't know which frame it is in so we
+    // must send a message to the other frames to clear their old right click
+    // events.
+    document.addEventListener("contextmenu", event =>
+    {
+      lastRightClickEvent = event;
+      lastRightClickEventIsMostRecent = true;
+
+      ext.backgroundPage.sendMessage({
+        type: "forward",
+        payload:
+        {
+          type: "composer.content.clearPreviousRightClickEvent"
+        }
+      });
+    }, true);
+
+    ext.onMessage.addListener((msg, sender, sendResponse) =>
+    {
+      switch (msg.type)
+      {
+        case "composer.content.getState":
+          if (window == window.top)
+          {
+            sendResponse({
+              active: currentlyPickingElement || blockelementPopupId != null
+            });
+          }
+          break;
+        case "composer.content.startPickingElement":
+          if (window == window.top)
+            startPickingElement();
+          break;
+        case "composer.content.contextMenuClicked":
+          let event = lastRightClickEvent;
+          deactivateBlockElement();
+          if (event)
+          {
+            getBlockableElementOrAncestor(event.target, element =>
+            {
+              if (element)
+              {
+                currentElement = element;
+                elementPicked(event);
+              }
+            });
+          }
+          break;
+        case "composer.content.finished":
+          if (currentElement && msg.remove)
+          {
+            // Hide the selected element itself if an added blocking
+            // filter is causing it to collapse. Note that this
+            // behavior is incomplete, but the best we can do here,
+            // e.g. if an added blocking filter matches other elements,
+            // the effect won't be visible until the page is is reloaded.
+            checkCollapse(currentElement.prisoner || currentElement);
+
+            // Apply added element hiding filters.
+            elemhide.apply();
+          }
+          deactivateBlockElement();
+          break;
+        case "composer.content.clearPreviousRightClickEvent":
+          if (!lastRightClickEventIsMostRecent)
+            lastRightClickEvent = null;
+          lastRightClickEventIsMostRecent = false;
+          break;
+        case "composer.content.dialogOpened":
+          if (window == window.top)
+            blockelementPopupId = msg.popupId;
+          break;
+        case "composer.content.dialogClosed":
+          // The onRemoved hook for the popup can create a race condition, so we
+          // to be careful here. (This is not perfect, but best we can do.)
+          if (window == window.top && blockelementPopupId == msg.popupId)
+          {
+            ext.backgroundPage.sendMessage({
+              type: "forward",
+              payload:
+              {
+                type: "composer.content.finished"
+              }
+            });
+          }
+          break;
       }
     });
-  }, true);
-
-  ext.onMessage.addListener((msg, sender, sendResponse) =>
-  {
-    switch (msg.type)
-    {
-      case "composer.content.getState":
-        if (window == window.top)
-        {
-          sendResponse({
-            active: currentlyPickingElement || blockelementPopupId != null
-          });
-        }
-        break;
-      case "composer.content.startPickingElement":
-        if (window == window.top)
-          startPickingElement();
-        break;
-      case "composer.content.contextMenuClicked":
-        let event = lastRightClickEvent;
-        deactivateBlockElement();
-        if (event)
-        {
-          getBlockableElementOrAncestor(event.target, element =>
-          {
-            if (element)
-            {
-              currentElement = element;
-              elementPicked(event);
-            }
-          });
-        }
-        break;
-      case "composer.content.finished":
-        if (currentElement && msg.remove)
-        {
-          // Hide the selected element itself if an added blocking
-          // filter is causing it to collapse. Note that this
-          // behavior is incomplete, but the best we can do here,
-          // e.g. if an added blocking filter matches other elements,
-          // the effect won't be visible until the page is is reloaded.
-          checkCollapse(currentElement.prisoner || currentElement);
-
-          // Apply added element hiding filters.
-          elemhide.apply();
-        }
-        deactivateBlockElement();
-        break;
-      case "composer.content.clearPreviousRightClickEvent":
-        if (!lastRightClickEventIsMostRecent)
-          lastRightClickEvent = null;
-        lastRightClickEventIsMostRecent = false;
-        break;
-      case "composer.content.dialogOpened":
-        if (window == window.top)
-          blockelementPopupId = msg.popupId;
-        break;
-      case "composer.content.dialogClosed":
-        // The onRemoved hook for the popup can create a race condition, so we
-        // to be careful here. (This is not perfect, but best we can do.)
-        if (window == window.top && blockelementPopupId == msg.popupId)
-        {
-          ext.backgroundPage.sendMessage({
-            type: "forward",
-            payload:
-            {
-              type: "composer.content.finished"
-            }
-          });
-        }
-        break;
-    }
-  });
-
-  if (window == window.top)
-    ext.backgroundPage.sendMessage({type: "composer.ready"});
-}
+
+    if (window == window.top)
+      ext.backgroundPage.sendMessage({type: "composer.ready"});
+  }
+}
+
+exports.setupComposer = setupComposer;