The first step to understanding this problem would be to see if it occurs with a current version of Midori; 0.4.3 is very old. This looks like a webkit bug, which would best be reported to the webkitgtk+ bug tracker if the same crashes occur when visiting the sites after starting Midori with the command "midori --plain". It's impossible to tell more about what the crash is without having debug information for the webkitgtk+ library installed when Midori crashes.
The first step to understanding this problem would be to see if it occurs with a current version of Midori; 0.4.3 is very old. This looks like a webkit bug, which would best be reported to the webkitgtk+ bug tracker if the same crashes occur when visiting the sites after starting Midori with the command "midori --plain". It's impossible to tell more about what the crash is without having debug information for the webkitgtk+ library installed when Midori crashes.