diff -up webkitgtk-2.17.3/Source/WebKit2/NetworkProcess/EntryPoint/unix/NetworkProcessMain.cpp.orig webkitgtk-2.17.3/Source/WebKit2/NetworkProcess/EntryPoint/unix/NetworkProcessMain.cpp
--- webkitgtk-2.17.3/Source/WebKit2/NetworkProcess/EntryPoint/unix/NetworkProcessMain.cpp.orig	2017-05-22 11:25:38.492770258 +0200
+++ webkitgtk-2.17.3/Source/WebKit2/NetworkProcess/EntryPoint/unix/NetworkProcessMain.cpp	2017-05-22 11:25:57.212665811 +0200
@@ -39,7 +39,7 @@ int main(int argc, char** argv)
     // overwrite this priority string if it's already set by the user.
     // https://bugzilla.gnome.org/show_bug.cgi?id=738633
     // WARNING: This needs to be KEPT IN SYNC with WebProcessMain.cpp.
-    setenv("G_TLS_GNUTLS_PRIORITY", "NORMAL:%COMPAT:!VERS-SSL3.0:!ARCFOUR-128", 0);
+    setenv("G_TLS_GNUTLS_PRIORITY", "@SYSTEM:%COMPAT:!VERS-SSL3.0:!ARCFOUR-128", 0);
 
     return NetworkProcessMainUnix(argc, argv);
 }
diff -up webkitgtk-2.17.3/Source/WebKit2/WebProcess/EntryPoint/unix/WebProcessMain.cpp.orig webkitgtk-2.17.3/Source/WebKit2/WebProcess/EntryPoint/unix/WebProcessMain.cpp
--- webkitgtk-2.17.3/Source/WebKit2/WebProcess/EntryPoint/unix/WebProcessMain.cpp.orig	2017-05-22 11:26:12.941578052 +0200
+++ webkitgtk-2.17.3/Source/WebKit2/WebProcess/EntryPoint/unix/WebProcessMain.cpp	2017-05-22 11:26:25.051510485 +0200
@@ -39,7 +39,7 @@ int main(int argc, char** argv)
     // overwrite this priority string if it's already set by the user.
     // https://bugzilla.gnome.org/show_bug.cgi?id=738633
     // WARNING: This needs to be KEPT IN SYNC with WebProcessMain.cpp.
-    setenv("G_TLS_GNUTLS_PRIORITY", "NORMAL:%COMPAT:!VERS-SSL3.0:!ARCFOUR-128", 0);
+    setenv("G_TLS_GNUTLS_PRIORITY", "@SYSTEM:%COMPAT:!VERS-SSL3.0:!ARCFOUR-128", 0);
 
     return WebProcessMainUnix(argc, argv);
 }