YouTube does not support 4K video playback in Safari for Mac. This extension shows abadge in the toolbar if a YouTube video you watch offers quality higher than 1080p. Click the toolbar icon to open the video in Chrome browser and enjoy it in full 4K glory.
This way you can open any page in Chrome, not just YouTube videos.
You don’t even need a 4K TV or monitor to benefit from this app. Most modern MacBook and iMac models have native resolution higher than the maximum 1080p supported by YouTube on Safari.
Now when you watch YouTube videos in Safari the extension will let you know if there’s 4K quality available. Look out for thebadge in the toolbar. Click the toolbar button to watch the 4K version of the video in Chrome.
You can open any page in Chrome this way. Shift-click the toolbar icon to also close the page in Safari when you open it in Chrome.
When you’re done with watching videos and want to boost your productivity.