TTM expands the main video view and moves the chat box to the right hand side. Additionally, all other on-screen elements get hidden. All changes revert upon leaving theater mode. Leave a comment in the reviews if things bug out and I'll fix them over time. 👍 (v5.02 Updated March 2025: updated internal "manifest" file version to v3 to appease Chrome) v5.01 Updated March 7 2024: fix for chatbox being short or hidden when window is narrow v5.00 Updated March 2024: made modifications accounting for YouTube's Theater Mode Update v4.00 Updated June 2023! 🥳🎉 (pre-v4.00 Updated June 2020... 😓)