@Override
	protected synchronized void programDeactivated(Program program) {
		provider.setProgram(null);
		navUpdater.setProgram(null);
		program.removeListener(domainObjectListener);
		disposeAllBookmarkers();
		bookmarkMgr = null;
	}
Get or create a bookmark navigator for the specified bookmark type

@param type the bookmark type
@return bookmark navigator
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/bookmark/BookmarkPlugin.java