Open JAR packaged JavaDoc documentation in Firefox. Especially useful for Maven users. You will need to set Firefox as your external browser. If the JavaDoc target is not a JAR file, this will behave similarly to the native "Open In Browser".
In order for this to work in OS X you must create an executable script and have Idea use this instead of the default browser. This is the contents of mine:#!/bin/sh osascript -e "tell application \"Firefox\"" -e "activate" -e "OpenURL \"$1\"" -e "end tell"