gistfile1.java

		IExtensionRegistry registry = Platform.getExtensionRegistry();
		Object token = getMasterToken(registry);
		if (token == null) {
			return;
		}
		Bundle ide = Platform.getBundle("org.eclipse.ui.ide");
		String id = "" + ide.getBundleId();
		IExtension[] extensions = registry.getExtensions(ide.getSymbolicName());
		for (IExtension ext : extensions) {
			if ("org.eclipse.ui.preferencePages".equals(ext
					.getExtensionPointUniqueIdentifier())) {
				registry.removeExtension(ext, token);

				break;
			}
		}
		try {
			InputStream properties = ide.getEntry("plugin.properties")
					.openStream();
			ResourceBundle resources = new PropertyResourceBundle(properties);
			registry.addContribution(
					getClass().getResourceAsStream("prefPage.txt"),
					new RegistryContributor(id, ide.getSymbolicName(), null,
							null), false, "Add CSS key", resources, token);
		} catch (IOException e) {
			Activator
					.getDefault()
					.getLog()
					.log(new Status(IStatus.WARNING, Activator.PLUGIN_ID,
							"unable to load plugin.properties", e));
		}

gistfile2.txt

<?xml version="1.0"?>
<extension point="org.eclipse.ui.preferencePages">
  <page name="%PreferencePages.Workbench" class="org.eclipse.ui.internal.ide.dialogs.IDEWorkbenchPreferencePage" id="org.eclipse.ui.preferencePages.Workbench">
    <keywordReference id="org.eclipse.ui.ide.general"/>
  </page>
  <page name="%PreferencePages.Editors" category="org.eclipse.ui.preferencePages.Workbench" class="org.eclipse.ui.internal.ide.dialogs.IDEEditorsPreferencePage" id="org.eclipse.ui.preferencePages.Editors">
    <keywordReference id="org.eclipse.ui.ide.editing"/>
    <keywordReference id="org.eclipse.ui.ide.tabs"/>
    <keywordReference id="org.eclipse.ui.ide.editors"/>
    <keywordReference id="org.eclipse.ui.ide.reuse"/>
    <keywordReference id="org.eclipse.ui.ide.pin"/>
    <keywordReference id="org.eclipse.ui.ide.dirty"/>
    <keywordReference id="org.eclipse.ui.ide.close"/>
    <keywordReference id="org.eclipse.ui.ide.recentlyOpened"/>
    <keywordReference id="org.eclipse.ui.ide.restore"/>
    <keywordReference id="org.eclipse.ui.ide.state"/>
  </page>
  <page name="%PreferencePages.Perspectives" category="org.eclipse.ui.preferencePages.Workbench" class="org.eclipse.ui.internal.ide.dialogs.IDEPerspectivesPreferencePage" id="org.eclipse.ui.preferencePages.Perspectives">
    <keywordReference id="org.eclipse.ui.ide.appearance"/>
    <keywordReference id="org.eclipse.ui.ide.perspectives"/>
  </page>
  <page name="%PreferencePages.FileEditors" category="org.eclipse.ui.preferencePages.Editors" class="org.eclipse.ui.ExtensionFactory:fileAssociationsPreferencePage" id="org.eclipse.ui.preferencePages.FileEditors">
    <keywordReference id="org.eclipse.ui.ide.editing"/>
    <keywordReference id="org.eclipse.ui.ide.editors"/>
  </page>
  <page name="%PreferencePages.Views" category="org.eclipse.ui.preferencePages.Workbench" class="org.eclipse.ui.ExtensionFactory:appearancePreferencePage" id="org.eclipse.ui.preferencePages.Views">
    <keywordReference id="org.eclipse.ui.ide.appearance"/>
    <keywordReference id="org.eclipse.ui.ide.colorlabels"/>
    <keywordReference id="org.eclipse.ui.ide.themes"/>
    <keywordReference id="org.eclipse.ui.ide.tabs"/>
    <keywordReference id="org.eclipse.ui.ide.apearancepage"/>
    <keywordReference id="org.eclipse.ui.ide.animations">
         </keywordReference>
    <keywordReference id="org.eclipse.e4.tools.orion.css.editor.keyword"/>
  </page>
  <page name="%PreferencePages.ColorsAndFonts" category="org.eclipse.ui.preferencePages.Views" class="org.eclipse.ui.ExtensionFactory:colorsAndFontsPreferencePage" id="org.eclipse.ui.preferencePages.ColorsAndFonts">
    <keywordReference id="org.eclipse.ui.ide.appearance"/>
    <keywordReference id="org.eclipse.ui.ide.themes"/>
    <keywordReference id="org.eclipse.ui.ide.textFont"/>
    <keywordReference id="org.eclipse.ui.ide.textEditorFont"/>
    <keywordReference id="org.eclipse.ui.ide.editorFont"/>
  </page>
  <page name="%PreferencePages.Decorators" category="org.eclipse.ui.preferencePages.Views" class="org.eclipse.ui.ExtensionFactory:decoratorsPreferencePage" id="org.eclipse.ui.preferencePages.Decorators">
    <keywordReference id="org.eclipse.ui.ide.appearance"/>
  </page>
  <page category="org.eclipse.ui.preferencePages.Workbench" class="org.eclipse.ui.internal.ide.dialogs.IDEWorkspacePreferencePage" id="org.eclipse.ui.preferencePages.Workspace" name="%PreferencePages.Workspace">
    <keywordReference id="org.eclipse.ui.ide.workspace"/>
    <keywordReference id="org.eclipse.ui.ide.encoding"/>
  </page>
  <page category="org.eclipse.ui.preferencePages.Workspace" name="%PreferencePages.BuildOrder" class="org.eclipse.ui.internal.ide.dialogs.BuildOrderPreferencePage" id="org.eclipse.ui.preferencePages.BuildOrder">
      </page>
  <page name="%PreferencePages.FileStates" category="org.eclipse.ui.preferencePages.Workspace" class="org.eclipse.ui.internal.ide.dialogs.FileStatesPage" id="org.eclipse.ui.preferencePages.FileStates">
      </page>
  <page name="%PreferencePages.LinkedResources" category="org.eclipse.ui.preferencePages.Workspace" class="org.eclipse.ui.internal.ide.dialogs.LinkedResourcesPreferencePage" id="org.eclipse.ui.preferencePages.LinkedResources">
    <keywordReference id="org.eclipse.ui.ide.linked"/>
  </page>
  <page name="%PreferencePages.NewKeys" category="org.eclipse.ui.preferencePages.Workbench" class="org.eclipse.ui.ExtensionFactory:newKeysPreferencePage" id="org.eclipse.ui.preferencePages.Keys">
    <keywordReference id="org.eclipse.ui.ide.keys"/>
  </page>
  <page class="org.eclipse.ui.ExtensionFactory:contentTypesPreferencePage" id="org.eclipse.ui.preferencePages.ContentTypes" category="org.eclipse.ui.preferencePages.Workbench" name="%PreferencePages.ContentTypes">
    <keywordReference id="org.eclipse.ui.ide.editing"/>
    <keywordReference id="org.eclipse.ui.ide.encoding"/>
  </page>
</extension>