PDE provides a single form-based multi-page plug-in manifest editor that manages all plug-in files: MANIFEST.MF, plugin.xml, fragment.xml and build.properties. The plug-in manifest editor is used as though a single file is being edited; while, PDE handles the task of writing the data to the different files on disk.
For details on the individual editor pages, refer to the following documents:
By default, the plug-in manifest editor shows information and tabs on extensions, extension points and Equinox-specific MANIFEST.MF headers and attributes. If you do not wish to use these Eclipse-specific features, you can filter out these pages from the editor on the Plug-in Development property page of your plug-in project via Properties > Plug-in Development from the context menu of plug-in projects.