2 files changed, 20 insertions, 24 deletions
diff --git a/toolkit/modules/LightweightThemeConsumer.sys.mjs b/toolkit/modules/LightweightThemeConsumer.sys.mjs
index cf388eb3d3..0d3993370b 100644
--- a/toolkit/modules/LightweightThemeConsumer.sys.mjs
+++ b/toolkit/modules/LightweightThemeConsumer.sys.mjs
@@ -183,7 +183,26 @@ const toolkitVariableMap = [
     "--newtab-background-color-secondary",
     { lwtProperty: "ntp_card_background" },
   ],
-  ["--newtab-text-primary-color", { lwtProperty: "ntp_text" }],
+  [
+    "--newtab-text-primary-color",
+    {
+      lwtProperty: "ntp_text",
+      processColor(rgbaChannels, element) {
+        if (!rgbaChannels) {
+          element.removeAttribute("lwt-newtab-brighttext");
+          return null;
+        }
+
+        const { r, g, b } = rgbaChannels;
+        element.toggleAttribute(
+          "lwt-newtab-brighttext",
+          0.2125 * r + 0.7154 * g + 0.0721 * b > 110
+        );
+
+        return _rgbaToString(rgbaChannels);
+      },
+    },
+  ],
 ];
 
 export function LightweightThemeConsumer(aDocument) {
diff --git a/toolkit/xre/nsWindowsWMain.cpp b/toolkit/xre/nsWindowsWMain.cpp
index 2a91deec5c..7eb9e11046 100644
--- a/toolkit/xre/nsWindowsWMain.cpp
+++ b/toolkit/xre/nsWindowsWMain.cpp
@@ -111,32 +111,9 @@ static void FreeAllocStrings(int argc, char** argv) {
   delete[] argv;
 }
 
-// Remove "/prefetch:##" argument from the command line, if present. (See
-// GeckoChildProcessHost.cpp for details.)
-//
-// Colons are not permitted in path-elements on Windows, so a string of this
-// form is extremely unlikely to appear with the intent of being a legitimate
-// path-argument.
-void RemovePrefetchArguments(int& argc, WCHAR** argv) {
-  size_t prefetchArgsCount [[maybe_unused]] = 0;
-  for (int i = 0; i < argc; ++i) {
-    constexpr const wchar_t prefix[] = L"/prefetch:";
-    auto const cmp = wcsncmp(argv[i], prefix, ARRAYSIZE(prefix) - 1);
-    if (cmp == 0) {
-      std::copy(argv + i + 1, argv + argc, argv + i);
-      --argc;
-      --i;
-      prefetchArgsCount++;
-    }
-  }
-  MOZ_ASSERT(prefetchArgsCount <= 1,
-             "at most one /prefetch:## argument should be present");
-}
-
 int wmain(int argc, WCHAR** argv) {
   SanitizeEnvironmentVariables();
   SetDllDirectoryW(L"");
-  RemovePrefetchArguments(argc, argv);
 
   // Only run this code if LauncherProcessWin.h was included beforehand, thus
   // signalling that the hosting process should support launcher mode.