diff --git a/src/main.c b/src/main.c
--- a/src/main.c
+++ b/src/main.c
@@ -36,6 +36,17 @@
 #include "profile.h"
 #include "game.h"
 
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+
+/* Chamado pela pagina quando a aba some ou fecha: o jogo so grava as opcoes ao sair. */
+EMSCRIPTEN_KEEPALIVE void fredygames_save(void)
+{
+    configSave();
+    profileSave();
+}
+#endif
+
 // timer -- timer.c //
 extern struct timeb t_c, t_lc;
 // quit game quickly ? //
@@ -151,9 +162,12 @@
     M_Add(new, ME_CrtSub(_("Back"), _main));
     // graphics //
     M_Add(gfx, ME_CrtSw2(_("Animations:"), &config.animations, _("Off"), _("On")));
+#ifndef __EMSCRIPTEN__
+    /* no navegador a pagina cuida do tamanho e da tela cheia */
     e = ME_CrtSw2(_("Fullscreen:"), &config.fullscreen, _("Off"), _("On"));
     e->cb = handleFullscreenChange;
     M_Add(gfx, e);
+#endif
     M_Add(gfx, ME_CrtSw2(_("Dim Effect:"), &config.dim, _("Off"), _("On")));
     M_Add(gfx, ME_CrtSep(""));
     M_Add(gfx, ME_CrtSub(_("Back"), _main));
diff --git a/src/sdl.c b/src/sdl.c
--- a/src/sdl.c
+++ b/src/sdl.c
@@ -694,9 +694,18 @@
  */
 void Sdl_StVdMd(int vres)
 {
-	int cdidx = sdlGetDisplayId();
+	int cdidx;
 	int ww, wh; /* window size */
 
+#ifdef __EMSCRIPTEN__
+	/* no navegador a janela e o canvas da pagina, sempre 640x480 (a pagina escala); a tecla F
+	 * nao muda nada */
+	if (window)
+		return;
+	vres = 480;
+#endif
+	cdidx = sdlGetDisplayId();
+
 	/* reset viewport */
 	viewport.x = 0;
 	viewport.y = 0;