--- seamonkey-2.39/suite/browser/browser-prefs.js.crash-and-fullscreen	2015-11-13 01:24:48.805746225 +0100
+++ seamonkey-2.39/suite/browser/browser-prefs.js	2015-11-13 01:25:52.653544788 +0100
@@ -979,3 +979,10 @@
 // Disable cache v2 since migration has not been done, it is pending in bug 1021843.
 pref("browser.cache.use_new_backend",       0);
 pref("browser.cache.use_new_backend_temp",  false);
+
+// Enable the DOM fullscreen API.
+pref("full-screen-api.enabled", true);
+
+// This new feature makes iceape crash a lot so disable it for now.
+// Using bundled cairo may help as well...
+pref("layers.offmainthreadcomposition.enabled", false);