235380 - firefox should set itself as default browser only for the current user. Change Windows Shell Service to add an additional option - whether to set default browser for all users or just the current user. Also make the code read out of HKCU instead of HKLM.

browser/components/shell/src/nsWindowsShellService.h

@@ -58,7 +58,7 @@ protected:
   PRBool    GetMailAccountKey(HKEY* aResult);
   void      SetRegKey(const char* aKeyName, const char* aValueName, 
                       const char* aValue, PRBool aBackup, HKEY aBackupKey,
-                      PRBool aReplaceExisting);
+                      PRBool aReplaceExisting, PRBool aForAllUsers);
 
 private:
   PRBool    mCheckedThisSession;