--- seamonkey-2.48/suite/browser/browser-prefs.js.crash-and-fullscreen	2017-08-03 01:15:46.431385113 +0200
+++ seamonkey-2.48/suite/browser/browser-prefs.js	2017-08-03 01:49:47.142323518 +0200
@@ -932,6 +932,10 @@
 // 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);
+
 // Most DevTools prefs are set from the shared file
 // devtools/client/preferences/devtools.js, but this one is currently set
 // per-app or per-channel.