Wireshark is an awesome tool, I am sure you all know that, but when you run it on Mac OS X it looks pretty horrible. Font sizes are disproportionate, it looks ugly. It all comes from the default
gtk configuration it uses.
In order to make it look better, just change your
gtk settings by running this on the command line:
echo 'gtk-font-name = "Sans 10"' > ~/.gtkrc-2.0
Note: This will change the font size for all your
gtk apps, but I bet you don’t have many. There are other things you can do which involve changing the default settings shipped inside the
Wireshark.app package, but you’d lose those after every upgrade.