diff --git a/Sources/AppBundle/model/AxUiElementWindowType.swift b/Sources/AppBundle/model/AxUiElementWindowType.swift
index 19e6a5f96..014c15dad 100644
--- a/Sources/AppBundle/model/AxUiElementWindowType.swift
+++ b/Sources/AppBundle/model/AxUiElementWindowType.swift
@@ -133,6 +133,16 @@ extension AxUiElementMock {
             return false
         }
 
+        // Emacs child frames (posframes, corfu completion popups, etc.)
+        // These are transient UI elements that should not be managed as windows.
+        // https://github.com/nikitabobko/AeroSpace/issues/776
+        if id == .emacs &&
+            get(Ax.subroleAttr) == kAXFloatingWindowSubrole &&
+            get(Ax.isMainAttr) == false
+        {
+            return false
+        }
+
         if id?.isFirefox != true {
             return isWindowHeuristicOld(axApp: axApp, id)
         }
diff --git a/axDumps/emacs.json5 b/axDumps/emacs.json5
new file mode 100644
index 000000000..6e8ed548e
--- /dev/null
+++ b/axDumps/emacs.json5
@@ -0,0 +1,111 @@
+{
+  "AXActivationPoint" : "<AXValue 0xc70311e90> {value = x:75.000000 y:58.000000 type = kAXValueCGPointType}",
+  "AXCancelButton" : null,
+  "AXCloseButton" : {
+    "AXEnabled" : 1,
+    "AXParent" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXRole" : "AXButton",
+    "AXSubrole" : "AXCloseButton",
+    "AXTitle" : null,
+    "AXTopLevelUIElement" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXWindow" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "Aero.AxFailed" : "get.AXTitle(noValue)",
+    "Aero.AxIgnored" : "AXFrame, AXSize, AXFocused, AXHelp, AXPosition, AXRoleDescription, AXEdited"
+  },
+  "AXDefaultButton" : null,
+  "AXDocument" : null,
+  "AXFocused" : 1,
+  "AXFrame" : "<AXValue 0xc702753c0> {value = x:5.000000 y:44.000000 w:893.000000 h:1119.000000 type = kAXValueCGRectType}",
+  "AXFullScreen" : 0,
+  "AXFullScreenButton" : {
+    "AXEnabled" : 1,
+    "AXParent" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXRole" : "AXButton",
+    "AXSubrole" : "AXFullScreenButton",
+    "AXTitle" : null,
+    "AXTopLevelUIElement" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXWindow" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "Aero.AxFailed" : "get.AXTitle(noValue)",
+    "Aero.AxIgnored" : "AXFrame, AXSize, AXFocused, AXChildren, AXHelp, AXPosition, AXRoleDescription"
+  },
+  "AXGrowArea" : null,
+  "AXMain" : 1,
+  "AXMinimizeButton" : {
+    "AXEnabled" : 1,
+    "AXParent" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXRole" : "AXButton",
+    "AXSubrole" : "AXMinimizeButton",
+    "AXTitle" : null,
+    "AXTopLevelUIElement" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXWindow" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "Aero.AxFailed" : "get.AXTitle(noValue)",
+    "Aero.AxIgnored" : "AXFrame, AXSize, AXFocused, AXHelp, AXPosition, AXRoleDescription"
+  },
+  "AXMinimized" : 0,
+  "AXModal" : 0,
+  "AXParent" : "<AXUIElement Application 0xc6f7778a0> {pid=6999}",
+  "AXPosition" : "<AXValue 0xc70312250> {value = x:5.000000 y:44.000000 type = kAXValueCGPointType}",
+  "AXProxy" : null,
+  "AXRole" : "AXWindow",
+  "AXSections" : [
+    "{\n    SectionDescription = Content;\n    SectionObject = \"<AXUIElement 0xc6f7778a0> {pid=6999}\";\n    SectionUniqueID = AXContent;\n}"
+  ],
+  "AXSize" : "<AXValue 0xc70312190> {value = w:893.000000 h:1119.000000 type = kAXValueCGSizeType}",
+  "AXSubrole" : "AXStandardWindow",
+  "AXTitle" : "*doom* – Doom Emacs  —  (109 × 67)",
+  "AXTitleUIElement" : "AXUIElement(AxWindowId=86039, title=nil, role=\"AXStaticText\", subrole=nil)",
+  "AXToolbarButton" : null,
+  "AXZoomButton" : {
+    "AXEnabled" : 1,
+    "AXParent" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXRole" : "AXButton",
+    "AXSubrole" : "AXFullScreenButton",
+    "AXTitle" : null,
+    "AXTopLevelUIElement" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXWindow" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "Aero.AxFailed" : "get.AXTitle(noValue)",
+    "Aero.AxIgnored" : "AXFrame, AXSize, AXFocused, AXChildren, AXHelp, AXPosition, AXRoleDescription"
+  },
+  "Aero.AXApp" : {
+    "AXExtrasMenuBar" : null,
+    "AXFocusedUIElement" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXFocusedWindow" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXFrame" : null,
+    "AXFrontmost" : 1,
+    "AXFunctionRowTopLevelElements" : [
+
+    ],
+    "AXMainWindow" : "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXMenuBar" : "<AXUIElement 0xc6f7778a0> {pid=6999}",
+    "AXPosition" : null,
+    "AXRole" : "AXApplication",
+    "AXSize" : null,
+    "AXTitle" : "Emacs",
+    "AXWindows" : [
+      "AXUIElement(AxWindowId=86039, title=\"*doom* – Doom Emacs  —  (109 × 67)\", role=\"AXWindow\", subrole=\"AXStandardWindow\")"
+    ],
+    "Aero.AxFailed" : "isWritable.AXFunctionRowTopLevelElements(failure), get.AXFrame(attributeUnsupported), isWritable.AXFrame(failure), get.AXExtrasMenuBar(noValue), isWritable.AXExtrasMenuBar(failure), get.AXSize(attributeUnsupported), isWritable.AXSize(attributeUnsupported), get.AXPosition(attributeUnsupported), isWritable.AXPosition(attributeUnsupported)",
+    "Aero.AxIgnored" : "AXChildren, AXChildrenInNavigationOrder, AXEnhancedUserInterface, AXPreferredLanguage, AXRoleDescription, AXHidden",
+    "Aero.AxWritable" : "AXFrontmost"
+  },
+  "Aero.App.appBundleId" : "org.gnu.Emacs",
+  "Aero.App.nsApp.activationPolicy" : "regular",
+  "Aero.App.nsApp.appBundlePath" : "file:///opt/homebrew/Cellar/emacs-plus@30/30.2/Emacs.app/",
+  "Aero.App.nsApp.execPath" : "file:///opt/homebrew/Cellar/emacs-plus@30/30.2/Emacs.app/Contents/MacOS/Emacs-real",
+  "Aero.App.pid" : 6999,
+  "Aero.App.version" : "9.0",
+  "Aero.App.versionShort" : "30.2",
+  "Aero.AxFailed" : "isWritable.AXFrame(failure), get.AXGrowArea(failure), get.AXDocument(noValue), isWritable.AXActivationPoint(failure), get.AXProxy(noValue), get.AXDefaultButton(noValue), get.AXCancelButton(noValue), get.AXToolbarButton(noValue)",
+  "Aero.AxIgnored" : "AXChildrenInNavigationOrder, AXChildren, AXRoleDescription",
+  "Aero.AxUiElementWindowType" : "window",
+  "Aero.AxUiElementWindowType_isDialogHeuristic" : false,
+  "Aero.AxWritable" : "AXFullScreen, AXPosition, AXSections, AXMain, AXMinimized, AXSize",
+  "Aero.axWindowId" : 86039,
+  "Aero.macOS.version" : "Version 26.2 (Build 25C56)",
+  "Aero.on-window-detected" : [
+
+  ],
+  "Aero.treeNodeParent" : "Optional(AppBundle.TilingContainer)",
+  "Aero.windowLevel" : "normalWindow",
+  "Aero.workspace" : "1"
+}
diff --git a/axDumps/emacs_child_frame_corfu.json5 b/axDumps/emacs_child_frame_corfu.json5
new file mode 100644
index 000000000..4624c0fa4
--- /dev/null
+++ b/axDumps/emacs_child_frame_corfu.json5
@@ -0,0 +1,60 @@
+// (enable/configure corfu) -> start typing -> select corfu completion candidate...
+{
+  "AXActivationPoint" : "<AXValue 0x88dc9a940> {value = x:-1.000000 y:1801.000000 type = kAXValueCGPointType}",
+  "AXCancelButton" : null,
+  "AXCloseButton" : null,
+  "AXDefaultButton" : null,
+  "AXDocument" : null,
+  "AXFocused" : 0,
+  "AXFrame" : "<AXValue 0x88c4e4240> {value = x:1518.000000 y:920.000000 w:270.000000 h:242.000000 type = kAXValueCGRectType}",
+  "AXFullScreen" : 0,
+  "AXFullScreenButton" : null,
+  "AXGrowArea" : null,
+  "AXMain" : 0,
+  "AXMinimizeButton" : null,
+  "AXMinimized" : 0,
+  "AXModal" : 0,
+  "AXParent" : "<AXUIElement Application 0x88c445200> {pid=39373}",
+  "AXPosition" : "<AXValue 0x88e0084b0> {value = x:1518.000000 y:920.000000 type = kAXValueCGPointType}",
+  "AXProxy" : null,
+  "AXRole" : "AXWindow",
+  "AXSections" : [],
+  "AXSize" : "<AXValue 0x88dc9b4e0> {value = w:270.000000 h:242.000000 type = kAXValueCGSizeType}",
+  "AXSubrole" : "AXFloatingWindow",
+  "AXTitle" : "EmacsCorfuGUI",
+  "AXTitleUIElement" : null,
+  "AXToolbarButton" : null,
+  "AXZoomButton" : null,
+  "Aero.AXApp" : {
+    "AXExtrasMenuBar" : null,
+    "AXFocusedUIElement" : "AXUIElement(AxWindowId=78408, title=\"test.py – Doom Emacs\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXFocusedWindow" : "AXUIElement(AxWindowId=78408, title=\"test.py – Doom Emacs\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXFrame" : null,
+    "AXFrontmost" : 1,
+    "AXFunctionRowTopLevelElements" : [],
+    "AXMainWindow" : "AXUIElement(AxWindowId=78408, title=\"test.py – Doom Emacs\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXMenuBar" : "<AXUIElement 0x88c445200> {pid=39373}",
+    "AXPosition" : null,
+    "AXRole" : "AXApplication",
+    "AXSize" : null,
+    "AXTitle" : "Emacs",
+    "AXWindows" : [
+      "AXUIElement(AxWindowId=78635, title=\"EmacsCorfuGUI\", role=\"AXWindow\", subrole=\"AXFloatingWindow\")",
+      "AXUIElement(AxWindowId=78408, title=\"test.py – Doom Emacs\", role=\"AXWindow\", subrole=\"AXStandardWindow\")"
+    ],
+    "Aero.AxIgnored" : "AXChildren, AXChildrenInNavigationOrder, AXEnhancedUserInterface, AXPreferredLanguage, AXRoleDescription, AXHidden"
+  },
+  "Aero.App.appBundleId" : "org.gnu.Emacs",
+  "Aero.App.nsApp.activationPolicy" : "regular",
+  "Aero.App.nsApp.execPath" : "file:///opt/homebrew/Cellar/emacs-plus@30/30.2/Emacs.app/Contents/MacOS/Emacs-real",
+  "Aero.App.version" : "9.0",
+  "Aero.App.versionShort" : "30.2",
+  "Aero.AxIgnored" : "AXChildrenInNavigationOrder, AXChildren, AXRoleDescription",
+  "Aero.axWindowId" : 78635,
+  "Aero.AxUiElementWindowType_isDialogHeuristic" : true,
+  "Aero.AxUiElementWindowType" : "popup",
+  "Aero.on-window-detected" : [],
+  "Aero.treeNodeParent" : "AppBundle.Workspace",
+  "Aero.windowLevel" : "normalWindow",
+  "Aero.workspace" : "1"
+}
diff --git a/axDumps/emacs_child_frame_posframe.json5 b/axDumps/emacs_child_frame_posframe.json5
new file mode 100644
index 000000000..68d05dad5
--- /dev/null
+++ b/axDumps/emacs_child_frame_posframe.json5
@@ -0,0 +1,60 @@
+// (enable/configure flycheck-posframe) -> provoke syntax error -> select flycheck-posframe error list candidate...
+{
+  "AXActivationPoint" : "<AXValue 0x88dc9b4e0> {value = x:-1.000000 y:1801.000000 type = kAXValueCGPointType}",
+  "AXCancelButton" : null,
+  "AXCloseButton" : null,
+  "AXDefaultButton" : null,
+  "AXDocument" : null,
+  "AXFocused" : 0,
+  "AXFrame" : "<AXValue 0x88c4e5900> {value = x:1607.000000 y:873.000000 w:490.000000 h:32.000000 type = kAXValueCGRectType}",
+  "AXFullScreen" : 0,
+  "AXFullScreenButton" : null,
+  "AXGrowArea" : null,
+  "AXMain" : 0,
+  "AXMinimizeButton" : null,
+  "AXMinimized" : 0,
+  "AXModal" : 0,
+  "AXParent" : "<AXUIElement Application 0x88c447570> {pid=39373}",
+  "AXPosition" : "<AXValue 0x88dc9bcf0> {value = x:1607.000000 y:873.000000 type = kAXValueCGPointType}",
+  "AXProxy" : null,
+  "AXRole" : "AXWindow",
+  "AXSections" : [],
+  "AXSize" : "<AXValue 0x88dc9bab0> {value = w:490.000000 h:32.000000 type = kAXValueCGSizeType}",
+  "AXSubrole" : "AXFloatingWindow",
+  "AXTitle" : "posframe",
+  "AXTitleUIElement" : null,
+  "AXToolbarButton" : null,
+  "AXZoomButton" : null,
+  "Aero.AXApp" : {
+    "AXExtrasMenuBar" : null,
+    "AXFocusedUIElement" : "AXUIElement(AxWindowId=78408, title=\"test.py – Doom Emacs\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXFocusedWindow" : "AXUIElement(AxWindowId=78408, title=\"test.py – Doom Emacs\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXFrame" : null,
+    "AXFrontmost" : 0,
+    "AXFunctionRowTopLevelElements" : [],
+    "AXMainWindow" : "AXUIElement(AxWindowId=78408, title=\"test.py – Doom Emacs\", role=\"AXWindow\", subrole=\"AXStandardWindow\")",
+    "AXMenuBar" : "<AXUIElement 0x88c447570> {pid=39373}",
+    "AXPosition" : null,
+    "AXRole" : "AXApplication",
+    "AXSize" : null,
+    "AXTitle" : "Emacs",
+    "AXWindows" : [
+      "AXUIElement(AxWindowId=78636, title=\"posframe\", role=\"AXWindow\", subrole=\"AXFloatingWindow\")",
+      "AXUIElement(AxWindowId=78408, title=\"test.py – Doom Emacs\", role=\"AXWindow\", subrole=\"AXStandardWindow\")"
+    ],
+    "Aero.AxIgnored" : "AXChildren, AXChildrenInNavigationOrder, AXEnhancedUserInterface, AXPreferredLanguage, AXRoleDescription, AXHidden"
+  },
+  "Aero.App.appBundleId" : "org.gnu.Emacs",
+  "Aero.App.nsApp.activationPolicy" : "regular",
+  "Aero.App.nsApp.execPath" : "file:///opt/homebrew/Cellar/emacs-plus@30/30.2/Emacs.app/Contents/MacOS/Emacs-real",
+  "Aero.App.version" : "9.0",
+  "Aero.App.versionShort" : "30.2",
+  "Aero.AxIgnored" : "AXChildrenInNavigationOrder, AXChildren, AXRoleDescription",
+  "Aero.axWindowId" : 78636,
+  "Aero.AxUiElementWindowType_isDialogHeuristic" : true,
+  "Aero.AxUiElementWindowType" : "popup",
+  "Aero.on-window-detected" : [],
+  "Aero.treeNodeParent" : "AppBundle.Workspace",
+  "Aero.windowLevel" : "normalWindow",
+  "Aero.workspace" : "1"
+}