The MultiPage editors such as plug-in manifest editor do not support navigation of tabs (pages of the editor) using keyboard. This plug-in implements that functionality for any MultiPage editor that subclasses org.eclipse.ui.part.MultiPageEditorPart and uses org.eclipse.swt.custom.CTabFolder to implement the tab folder.
Starting with Overview tab:
Type CTRL+TAB to go to Dependencies tab:
Type CTRL+SHIFT+TAB instead to go to build.properties tab: