Birdcage is a Chrome add-on developed by NPoole that aims to give users more control over their Twitter experience. This free program allows users to modify the Twitter user interface (UI) to suit their preferences and enhance their browsing experience.

With Birdcage, users can make promoted content translucent, making it easier to identify and differentiate from regular tweets. Additionally, users have the option to collapse promoted tweets, reducing clutter in their feed.

The add-on also offers the ability to turn off the in-tab tweet counter, providing a distraction-free browsing experience. Users can conveniently see their notification and direct message count directly in the tab, without the need to navigate to different pages.

Furthermore, Birdcage allows users to collapse the "Who To Follow" and "Trending" UI sections, minimizing distractions and focusing on the content that matters to them. Additionally, users can add Content Warnings (CWs) to tweets that contain specific words or phrases, providing an extra layer of control over their Twitter feed.

Overall, Birdcage is a useful tool for those who want to customize their Twitter experience and have more control over the content they see. With its various features, this Chrome add-on offers a way to enhance the browsing experience on Twitter.