diff --git a/src/firefox-patches/bug_1993474_fix.patch b/src/firefox-patches/bug_1993474_fix.patch
deleted file mode 100644
index b18363128..000000000
--- a/src/firefox-patches/bug_1993474_fix.patch
+++ /dev/null
@@ -1,30 +0,0 @@
-diff --git a/widget/windows/nsWindow.cpp b/widget/windows/nsWindow.cpp
-index 2a17159215d107f6e4b09cf3a63ab0fff2c2ee70..622bb36a184a87a1d755b19ff6c3c50027ae53f5 100644
---- a/widget/windows/nsWindow.cpp
-+++ b/widget/windows/nsWindow.cpp
-@@ -2848,6 +2848,25 @@ void nsWindow::SetCustomTitlebar(bool aCustomTitlebar) {
- 
-   mCustomNonClient = aCustomTitlebar;
- 
-+  // Because of bug 1993474, we want to properly set the WS_BORDER style
-+  // when the titlebar is turned on or off.
-+  //
-+  // The documentation for window styles says that most styles can't be
-+  // modified after the window is created. Testing shows that WS_BORDER
-+  // seems to be OK, but make sure this is the only style we try to change
-+  // here.
-+  const LONG_PTR actualStyle = ::GetWindowLongPtrW(mWnd, GWL_STYLE);
-+  LONG_PTR newStyle = actualStyle;
-+  if (mCustomNonClient) {
-+    newStyle &= ~WS_BORDER;
-+  } else {
-+    newStyle |= WS_BORDER;
-+  }
-+  if (newStyle != actualStyle) {
-+    VERIFY_WINDOW_STYLE(newStyle);
-+    ::SetWindowLongPtrW(mWnd, GWL_STYLE, newStyle);
-+  }
-+  
-   // Force a reflow of content based on the new client dimensions.
-   if (mCustomNonClient) {
-     UpdateNonClientMargins();