The bookmarks don't work in TIEmu 3.03 if it is linked against GTK+ >= 2.12.0.
The attached patch changes the bookmark code so that it behaves the following way:
* push the tooltips' content (mostly URLs) to the menu item labels, so which can be retrieved on GTK+ >= 2.16.0;
* GTK+ >= 2.16.0: retrieve the GtkMenuItem's label, parse it to extract the URL;
* GTK+ < 2.16.0: retrieve the GtkMenuItem's tooltip, parse it to extract the URL.