Bug 381283 - Prevent macOS startup crashes on case sensitive file systems. r=spohl

Differential Revision: https://phabricator.services.mozilla.com/D218895

xpcom/base/nsMacUtilsImpl.cpp

@@ -10,10 +10,11 @@
 #include "base/process_util.h"
 #include "mozilla/ClearOnShutdown.h"
 #include "mozilla/Omnijar.h"
-#include "nsDirectoryServiceDefs.h"
-#include "nsCOMPtr.h"
 #include "nsComponentManagerUtils.h"
+#include "nsCOMPtr.h"
+#include "nsDirectoryServiceDefs.h"
 #include "nsIFile.h"
+#include "nsReadableUtils.h"
 #include "nsServiceManagerUtils.h"
 #include "nsThreadUtils.h"
 #include "nsXULAppAPI.h"
@@ -84,15 +85,17 @@ bool nsMacUtilsImpl::GetAppPath(nsCString& aAppPath) {
     aAppPath.Assign(*sCachedAppPath);
     return true;
   }
-
   nsAutoCString appPath;
   nsAutoCString appBinaryPath(
       (CommandLine::ForCurrentProcess()->argv()[0]).c_str());
 
+  // Ensure binary path is lowercase to avoid crash
+  ToLowerCase(appBinaryPath);
+
   // The binary path resides within the .app dir in Contents/MacOS,
   // e.g., Firefox.app/Contents/MacOS/firefox. Search backwards in
   // the binary path for the end of .app path.
-  auto pattern = "/Contents/MacOS/"_ns;
+  auto pattern = "/contents/macos/"_ns;
   nsAutoCString::const_iterator start, end;
   appBinaryPath.BeginReading(start);
   appBinaryPath.EndReading(end);