If you actually installed a script called (e.g., from GreasyFork that reverts to the 2015 layout):
As of April 2026, YouTube has introduced major updates to how it functions in web browsers: youtube v4 browser hot
: A recent bug in the YouTube interface's flexible menu (containing like, share, and subscribe buttons) has caused constant layout recalculations, leading to frozen tabs on Chrome, Edge, and Firefox. If you actually installed a script called (e
for script development or performance optimizations for older systems. 1. Legacy Browser Support: YouTube v4 on Older Devices leading to frozen tabs on Chrome
Several high-performance media tools have recently hit version 4.0, focusing on speed and AI integration. Frame.io v4
I can provide a more structured outline or specific technical details once I know your focus.