h264ify is a Chrome/Firefox extension that makes YouTube stream H.264 videos instead of VP8/VP9 videos.
Try h264ify if YouTube videos stutter, take up too much CPU, eat battery life, or make your laptop hot.
By default, YouTube streams VP8/VP9 encoded video. However, this can cause problems with less powerful machines because VP8/VP9 is not typically hardware accelerated.
In contrast, H.264 is commonly hardware accelerated by GPUs, which usually means smoother video playback and reduced CPU usage.
Note: 4K and 1440p videos will not be available because YouTube no longer encodes those videos in H.264
Note: You may need to enable GPU acceleration as well
If all goes well, when you right click a video and select "Stats for nerds", you should see that the codec is AVC (H.264).
