Start with Enhancer for YouTube . It offers a "YouTube Center" style config panel, volume boost, forced playback quality, and cinema mode. It’s the spiritual heir. Conclusion: A Fond Farewell YouTube Center for Firefox was a masterpiece of user empowerment. It represented a time when one dedicated developer could outsmart a billion-dollar platform with a simple script.
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You could reorder buttons, hide the cinema view bar, change the player size, and even force the old 2010-era "Star" rating system back. Why Did YouTube Center Die on Firefox? If it was so great, why can’t you just install it today? Start with Enhancer for YouTube
Unlike modern extensions that focus on one specific problem, YouTube Center was a Swiss Army knife. It injected a massive "Configuration" menu directly into YouTube’s interface, allowing you to tweak almost every aspect of the site. Even by today’s standards, YouTube Center was ahead of its time. Here are the features that made Firefox users obsess over it: Conclusion: A Fond Farewell YouTube Center for Firefox
You could set auto-play to be off by default—a feature YouTube didn't officially offer for years.