I'm running Xfce 4.6.1 on a Debian system.
I can set the font size of my menus ("File", "Edit", etc.) in Iceweasel through Settings->Apearance. These are the same font size as the labels in my desktop icons.
But changing the font size here does not affect the menu font size in my other applications (gedit, epiphany, etc.).
1. How do I change the menu font size in general?
2. Why does Iceweasel follow the font size of my desktop?
Just poke around in the Settings, either in the Appearance-> Fonts tab or Window Manager-> Style