File / New / Project…

JavaScript / JavaScript project

Create new project in workspace, choose a name, e.g. test1

Next>

In dialog JavaScript Settings / Libraries do an Add Runtime Library…

Choose Qooxdoo Library

Your new project should appear in the "JavaScript perspective"

Your "resource view" might not show your new project. If so, deselect Empty parent folder in the associated filters, or simple add your first JavaScript file to the project.

Right-click on project folder to open a context menu

Web Development Tools / Add JavaScript Support

Right-click on project folder to open a context menu

Properties

JavaScript / JavaScript Libraries

Add Runtime Library…

Choose Qooxdoo Library