diff --git a/src/configfile.cc b/src/configfile.cc
index aaf5613..95abbd7 100644
--- a/src/configfile.cc
+++ b/src/configfile.cc
@@ -417,6 +417,9 @@ configfile::save ()
           break;
         }
       fprintf (config, ")\n");
+      /* fredygames.com browser build: the file was never closed, so its contents stayed in the
+       * stdio buffer until the program exited, which a browser tab never does */
+      fclose (config);
     }
 }
 
diff --git a/src/handler_audio.cc b/src/handler_audio.cc
index 78eed55..0279896 100644
--- a/src/handler_audio.cc
+++ b/src/handler_audio.cc
@@ -453,6 +453,11 @@ handler_audio::play_music (Uint32 music_id)
                 "Mix_LoadMUS return " << SDL_GetError () << std::endl;
       return;
     }
+#ifdef __EMSCRIPTEN__
+  /* fredygames.com browser build: the music is played over libmodplug (tbzmusic.c), which keeps the
+   * MikMod-like position */
+  song_module = tbz_music_module (current_music);
+#else
   /* Ugly way to access sdl-mixer's internal structures */
   union
   {
@@ -461,6 +466,7 @@ handler_audio::play_music (Uint32 music_id)
   } dummy;
   memcpy (&song_module, (Uint8 *) current_music + sizeof (dummy),
           sizeof (void *));
+#endif
 
   /* start the music */
   if (Mix_PlayMusic (current_music, -1) == -1)
diff --git a/src/handler_display.cc b/src/handler_display.cc
index 6dc8484..1fb6ab0 100644
--- a/src/handler_display.cc
+++ b/src/handler_display.cc
@@ -258,9 +258,12 @@ handler_display::get_info ()
           vi->vfmt->Gshift, vi->vfmt->Bshift, vi->vfmt->Ashift);
   printf ("Rloss=%i Gloss=%i Bloss=%i Aloss=%i \n", vi->vfmt->Rloss,
           vi->vfmt->Gloss, vi->vfmt->Bloss, vi->vfmt->Aloss);
+#ifndef __EMSCRIPTEN__
+  /* fredygames.com browser build: SDL2's SDL_PixelFormat has no colorkey or alpha */
   printf ("Pixel value of transparent pixels. colorkey=%i \n",
           vi->vfmt->colorkey);
   printf ("Overall surface alpha value. alpha=%i \n", vi->vfmt->alpha);
+#endif
   printf ("Is it possible to create hardware surfaces? hw_available=%i \n",
           vi->hw_available);
   printf ("Is there a window manager available wm_available=%i \n",
diff --git a/src/main.cc b/src/main.cc
index 35f91ad..5003052 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -32,6 +32,17 @@
 #include "../include/configfile.h"
 configfile configuration;
 
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+/* fredygames.com browser build: the page calls this when the tab is hidden or closed, because the
+ * game only writes its configuration when it quits (the high scores it writes at once) */
+extern "C" EMSCRIPTEN_KEEPALIVE void
+fredygames_save (void)
+{
+  configuration.save ();
+}
+#endif
+
 /**
  * Returns to the standard GP2X menu.
  */