addMutationObserver = () => {
  const observer = new MutationObserver((mutations) => {
    if (!mutations.length || isMutationSkippable(mutations)) return;
    runDynamicFeatures();
  });

  observer.observe(document, {
    childList: true,
    subtree: true,
  });
}
Initialization:
- Sets up MutationObserver for dynamic features
- Adds load/resize event listeners
- Loads and caches required stylesheets
- Extracts Twitter theme colors