We seem to be lagging a few versions behind the latest stable release of Webkit-GTK. As far as I understand we're on 2.32.x and the latest stable is 2.34.2, with several improvements and crashes fixed in the versions in between (see here)

The 2.34.2 tarball is here: https://webkitgtk.org/releases/webkitgtk-2.34.2.