diff --git a/webextensions/background/api-tabs-listener.js b/webextensions/background/api-tabs-listener.js
index c1aa424c7..a55507e05 100644
--- a/webextensions/background/api-tabs-listener.js
+++ b/webextensions/background/api-tabs-listener.js
@@ -330,7 +330,7 @@ async function onNewTabTracked(tab, info) {
   const duplicatedInternally = window.duplicatingTabsCount > 0;
   const maybeOrphan          = window.toBeOpenedOrphanTabs > 0;
   const activeTab            = Tab.getActiveTab(window.id);
-  const fromExternalApplication = !mAppIsActive;
+  const fromExternal         = !mAppIsActive;
 
   // New tab's index can become invalid because the value of "index" is same to
   // the one given to browser.tabs.create() (new tab) or the original index
@@ -362,7 +362,7 @@ async function onNewTabTracked(tab, info) {
     mayBeReplacedWithContainer,
     maybeOrphan,
     activeTab,
-    fromExternalApplication
+    fromExternal
   });
 
   if (Tab.needToWaitTracked(tab.windowId, { exceptionTabId: tab.id }))
@@ -471,7 +471,7 @@ async function onNewTabTracked(tab, info) {
       duplicated,
       duplicatedInternally,
       activeTab,
-      fromExternalApplication
+      fromExternal
     });
     // don't do await if not needed, to process things synchronously
     if (moved instanceof Promise)
@@ -516,7 +516,7 @@ async function onNewTabTracked(tab, info) {
       duplicatedInternally,
       originalTab: duplicated && Tab.get(uniqueId.originalTabId),
       treeForActionDetection,
-      fromExternalApplication
+      fromExternal
     });
     tab.$TST.resolveOpened();
 
diff --git a/webextensions/background/handle-new-tabs.js b/webextensions/background/handle-new-tabs.js
index fa91acf90..3403892f6 100644
--- a/webextensions/background/handle-new-tabs.js
+++ b/webextensions/background/handle-new-tabs.js
@@ -41,11 +41,11 @@ Tab.onCreating.addListener((tab, info = {}) => {
     TabsStore.addToBeGroupedTab(tab);
   }
   else {
+    let dontMove = false;
     if (!info.maybeOrphan &&
         possibleOpenerTab &&
         !info.restored) {
       let autoAttachBehavior = configs.autoAttachOnNewTabCommand;
-      let dontMove           = false;
       if (tab.$TST.nextTab &&
           possibleOpenerTab == tab.$TST.previousTab) {
         // New tab opened with browser.tabs.insertAfterCurrent=true may have
@@ -85,7 +85,17 @@ Tab.onCreating.addListener((tab, info = {}) => {
       else if (possibleOpenerTab != tab) {
         tab.$TST.possibleOpenerTab = possibleOpenerTab.id;
       }
-      tab.$TST.isNewTab = true;
+      tab.$TST.isNewTab = !info.fromExternal;
+    }
+    if (info.fromExternal) {
+      log('behave as a tab opened from external application');
+      return Tree.behaveAutoAttachedTab(tab, {
+        baseTab:   possibleOpenerTab,
+        behavior:  configs.autoAttachOnOpenedFromExternal,
+        dontMove,
+        inheritContextualIdentity: configs.inheritContextualIdentityToTabsFromExternal,
+        broadcast: true
+      }).then(moved => !moved);
     }
     log('behave as a tab opened with any URL');
     tab.$TST.positionedBySelf = info.positionedBySelf;
@@ -111,8 +121,9 @@ Tab.onCreating.addListener((tab, info = {}) => {
   else if (!info.maybeOrphan && configs.autoAttach) {
     return Tree.behaveAutoAttachedTab(tab, {
       baseTab:   opener,
-      behavior:  configs.autoAttachOnOpenedWithOwner,
+      behavior:  info.fromExternal ? configs.autoAttachOnOpenedFromExternal : configs.autoAttachOnOpenedWithOwner,
       dontMove:  info.positionedBySelf || info.mayBeReplacedWithContainer,
+      inheritContextualIdentity: info.fromExternal ? configs.inheritContextualIdentityToTabsFromExternal : false,
       broadcast: true
     }).then(moved => !moved);
   }
diff --git a/webextensions/common/common.js b/webextensions/common/common.js
index 923a326f3..bef927f65 100644
--- a/webextensions/common/common.js
+++ b/webextensions/common/common.js
@@ -144,6 +144,7 @@ export const configs = new Configs({
   autoAttachOnNewTabButtonMiddleClick: Constants.kNEWTAB_OPEN_AS_CHILD,
   autoAttachOnDuplicated: Constants.kNEWTAB_OPEN_AS_NEXT_SIBLING,
   autoAttachSameSiteOrphan: Constants.kNEWTAB_OPEN_AS_CHILD,
+  autoAttachOnOpenedFromExternal: Constants.kNEWTAB_DO_NOTHING,
   guessNewOrphanTabAsOpenedByNewTabCommand: true,
   guessNewOrphanTabAsOpenedByNewTabCommandUrl: 'about:newtab',
   inheritContextualIdentityToNewChildTab: false,