BrowserConfig config = frame.getConfig();
List<ClasspathEntry> oldEntries = new ArrayList<ClasspathEntry>(config.getClasspath());
for (ClasspathEntry entry : oldEntries) {
if (!newEntries.contains(entry)) {
config.removeClasspathEntry(entry);
}
}
for (ClasspathEntry entry : newEntries) {
if (!oldEntries.contains(entry)) {
config.addClasspathEntry(entry);