Firefox Community Forum

modify to suit your tastes or improve it? working now without any known issues.

using System.Diagnostics; using System.Runtime.InteropServices; using System.Text;

namespace FirefoxWindowPositioner {

   class Program {
       [DllImport("user32.dll", SetLastError = true)]
       private static extern bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);

       [DllImport("user32.dll", SetLastError = true)]
       private static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);

       [DllImport("user32.dll", SetLastError = true)]
       private static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);

       [DllImport("user32.dll")]
       [return: MarshalAs(UnmanagedType.Bool)]
       private static extern bool IsWindowVisible(IntPtr hWnd);

       [DllImport("user32.dll", SetLastError = true)]
       private static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);

       [DllImport("user32.dll", SetLastError = true)]
       private static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);

       [DllImport("user32.dll", SetLastError = true)]
       private static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName, int nMaxCount);

       private const uint GW_OWNER = 4;
       private const int MaxRetries = 100;
       private const int SleepTime = 200;
       private const string ClassNameToFind = "MozillaWindowClass";

       private delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);

       private static IntPtr foundWindowHandle = IntPtr.Zero;

       private static bool EnumWindowsCallback(IntPtr hWnd, IntPtr lParam) {
           uint processId;
           GetWindowThreadProcessId(hWnd, out processId);

           if (IsWindowVisible(hWnd) && GetWindow(hWnd, GW_OWNER) == IntPtr.Zero) {
               StringBuilder className = new StringBuilder(256);
               GetClassName(hWnd, className, className.Capacity);

               if (className.ToString() == ClassNameToFind) {
                   foundWindowHandle = hWnd;
                   Console.WriteLine($"Found window handle {hWnd} for process ID {processId}");
                   return false; // Stop enumerating windows once the desired window is found
               }
           }

           return true; // Continue enumerating windows
       }

       static void Main(string[] args) {
           string path = @"C:\Program Files\Mozilla Firefox\firefox.exe";

           // Define positions and sizes
           int[,] positions = new int[,]
           {
               {0, 0, 1284, 2120},
               {1280, 0, 1284, 2120},
               {2560, 0, 1284, 2120}
           };

           int initialDelay = 750; // Initial delay in milliseconds, 1000 worked
           int retryDelay = 200; // Delay between retries in milliseconds

           // Start three Firefox processes sequentially and move them to specified positions
           for (int i = 0; i < 3; i++) {
               Process firefoxProcess = Process.Start(path);
               Thread.Sleep(initialDelay); // Wait for the process to initialize

               foundWindowHandle = IntPtr.Zero;
               int retries = 0;

               while (foundWindowHandle == IntPtr.Zero && retries < MaxRetries) {
                   EnumWindows(EnumWindowsCallback, IntPtr.Zero);
                   if (foundWindowHandle == IntPtr.Zero) {
                       Thread.Sleep(retryDelay); // Wait before retrying
                       retries++;
                   }
               }

               if (foundWindowHandle != IntPtr.Zero) {
                   bool success = MoveWindow(foundWindowHandle, positions[i, 0], positions[i, 1], positions[i, 2], positions[i, 3], true);
                   if (success) {
                       Console.WriteLine($"Moved window {i + 1} to X: {positions[i, 0]}, Y: {positions[i, 1]}, Width: {positions[i, 2]}, Height: {positions[i, 3]}");
                   } else {
                       Console.WriteLine($"Failed to move window {i + 1}");
                   }
               } else {
                   Console.WriteLine($"Failed to get handle for Firefox process {i + 1}");
               }
           }
       }
   }

}

My configuration is the following: Windows 11, internal display connected to iGPU and external UHD display to nvidia-HDMI port, multiple firefox windows are opened (1 one the internal screen, 2 on the external).

Then in Windows->Settings->GPU I can select firefox to run on either iGPU (powersaving) or on Nvidia GPU (max perf), the problem is the following: Whenever I set firefox running on iGPU, there would be a massive stuttering/framedrop on an external display (connected to NVIDIA), while a perfectly smooth browsing on internal display, and vice versa.

My first attempt was to disable webrenderer compositor or switching it to a software rendering, which fixes the heavy stuttering, but the scrolling becomes overall less fluid/responsive.

However, setting "layers.gpu-process.enabled" to "false" seemingly solves this problem completely. Now I have a perfectly smooth scrolling on both displays, regardless of which GPU is used in Windows->Settings->GPU (nvidia's is arguably a little but more responsive).

Hope this helps someone, or maybe dev team could look deeper into this.

Thank you for the great browser!

Need help some one trying to make look crazy .there using there knowledge for there own evil ways.so please help thanks.