From fa5f62e1bd9e00c17e8e216bc85b317f1f065d35 Mon Sep 17 00:00:00 2001
From: Addison Beck <github@addisonbeck.com>
Date: Wed, 28 Jan 2026 16:00:56 -0500
Subject: [PATCH] Revert "[PM-26821] Improve macOS fullscreen ux (#16838)"
 (#18606)

This reverts commit 05ca57d538240d48cc28553e9f2dafe95b717a5a.
---
 .../browser/browser-popup-utils.spec.ts       | 64 -------------------
 .../platform/browser/browser-popup-utils.ts   | 23 +------
 2 files changed, 1 insertion(+), 86 deletions(-)

diff --git a/apps/browser/src/platform/browser/browser-popup-utils.spec.ts b/apps/browser/src/platform/browser/browser-popup-utils.spec.ts
index cb04f30b589..89459523843 100644
--- a/apps/browser/src/platform/browser/browser-popup-utils.spec.ts
+++ b/apps/browser/src/platform/browser/browser-popup-utils.spec.ts
@@ -140,11 +140,6 @@ describe("BrowserPopupUtils", () => {
 
   describe("openPopout", () => {
     beforeEach(() => {
-      jest.spyOn(BrowserApi, "getPlatformInfo").mockResolvedValueOnce({
-        os: "linux",
-        arch: "x86-64",
-        nacl_arch: "x86-64",
-      });
       jest.spyOn(BrowserApi, "getWindow").mockResolvedValueOnce({
         id: 1,
         left: 100,
@@ -155,8 +150,6 @@ describe("BrowserPopupUtils", () => {
         width: PopupWidthOptions.default,
       });
       jest.spyOn(BrowserApi, "createWindow").mockImplementation();
-      jest.spyOn(BrowserApi, "updateWindowProperties").mockImplementation();
-      jest.spyOn(BrowserApi, "getPlatformInfo").mockImplementation();
     });
 
     it("creates a window with the default window options", async () => {
@@ -274,63 +267,6 @@ describe("BrowserPopupUtils", () => {
         url: `chrome-extension://id/${url}?uilocation=popout&singleActionPopout=123`,
       });
     });
-
-    it("exits fullscreen and focuses popout window if the current window is fullscreen and platform is mac", async () => {
-      const url = "popup/index.html";
-      jest.spyOn(BrowserPopupUtils as any, "isSingleActionPopoutOpen").mockResolvedValueOnce(false);
-      jest.spyOn(BrowserApi, "getPlatformInfo").mockReset().mockResolvedValueOnce({
-        os: "mac",
-        arch: "x86-64",
-        nacl_arch: "x86-64",
-      });
-      jest.spyOn(BrowserApi, "getWindow").mockReset().mockResolvedValueOnce({
-        id: 1,
-        left: 100,
-        top: 100,
-        focused: false,
-        alwaysOnTop: false,
-        incognito: false,
-        width: PopupWidthOptions.default,
-        state: "fullscreen",
-      });
-      jest
-        .spyOn(BrowserApi, "createWindow")
-        .mockResolvedValueOnce({ id: 2 } as chrome.windows.Window);
-
-      await BrowserPopupUtils.openPopout(url, { senderWindowId: 1 });
-      expect(BrowserApi.updateWindowProperties).toHaveBeenCalledWith(1, {
-        state: "maximized",
-      });
-      expect(BrowserApi.updateWindowProperties).toHaveBeenCalledWith(2, {
-        focused: true,
-      });
-    });
-
-    it("doesnt exit fullscreen if the platform is not mac", async () => {
-      const url = "popup/index.html";
-      jest.spyOn(BrowserPopupUtils as any, "isSingleActionPopoutOpen").mockResolvedValueOnce(false);
-      jest.spyOn(BrowserApi, "getPlatformInfo").mockReset().mockResolvedValueOnce({
-        os: "win",
-        arch: "x86-64",
-        nacl_arch: "x86-64",
-      });
-      jest.spyOn(BrowserApi, "getWindow").mockResolvedValueOnce({
-        id: 1,
-        left: 100,
-        top: 100,
-        focused: false,
-        alwaysOnTop: false,
-        incognito: false,
-        width: PopupWidthOptions.default,
-        state: "fullscreen",
-      });
-
-      await BrowserPopupUtils.openPopout(url);
-
-      expect(BrowserApi.updateWindowProperties).not.toHaveBeenCalledWith(1, {
-        state: "maximized",
-      });
-    });
   });
 
   describe("openCurrentPagePopout", () => {
diff --git a/apps/browser/src/platform/browser/browser-popup-utils.ts b/apps/browser/src/platform/browser/browser-popup-utils.ts
index c8dba57e708..7333023d178 100644
--- a/apps/browser/src/platform/browser/browser-popup-utils.ts
+++ b/apps/browser/src/platform/browser/browser-popup-utils.ts
@@ -168,29 +168,8 @@ export default class BrowserPopupUtils {
     ) {
       return;
     }
-    const platform = await BrowserApi.getPlatformInfo();
-    const isMacOS = platform.os === "mac";
-    const isFullscreen = senderWindow.state === "fullscreen";
-    const isFullscreenAndMacOS = isFullscreen && isMacOS;
-    //macOS specific handling for improved UX when sender in fullscreen aka green button;
-    if (isFullscreenAndMacOS) {
-      await BrowserApi.updateWindowProperties(senderWindow.id, {
-        state: "maximized",
-      });
 
-      //wait for macOS animation to finish
-      await new Promise((resolve) => setTimeout(resolve, 1000));
-    }
-
-    const newWindow = await BrowserApi.createWindow(popoutWindowOptions);
-
-    if (isFullscreenAndMacOS) {
-      await BrowserApi.updateWindowProperties(newWindow.id, {
-        focused: true,
-      });
-    }
-
-    return newWindow;
+    return await BrowserApi.createWindow(popoutWindowOptions);
   }
 
   /**