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I am using NetBeans IDE 6.5.1 with Java v1.6.0_11 Currently, given by the instructions in the Help Documentation - open the Help Viewer "Help > Help Contents" and navigate the "Contents" tab to: IDE Basics > Configuring the IDE > Accessibility > Setting Font and Color for the Help Viewer you have to modify the "ide.css" file manually to change the font display settings (i.e. font & colour) for Help Viewer content and other related help content such as the IDE Editor inline Javadoc viewer (activate it by placing cursor on Java API class/method and execute Ctrl+Shift+Space or use option "Show Documentation" from "Source" menu). Instead of textually changing the "ide.css" file, a feature could be included as part of the standard IDE UI options for streamlined help display properties access and modification -> there could be a "Help Doc" tab under Tools > Options > Fonts & Colors
Reassigning as this is a feature enhancement request.