Chrome refers to an application's user interface elements, such as toolbars, menus and status bars.
Depending on the size and complexity of the interface project, there may be additional files, including images and platform-specific data, and there may be fewer files, but there will always be at least one XUL file. The XUL files describing windows and user-interface elements as well as scripts are located in the packages subdirectory. Style sheets and images should be stored in the skin directory, while all text displayed in a window is stored in the locale directory. The chrome directory is found in any Netscape 6 installation. In the packages directory, which describes the components, reside subsequent subdirectories, each representing Netscape 6 components.