Makes YouTube stream H.264 videos instead of VP8/VP9 videos

h264ify promo image
What is h264ify?

"h264ify" is a Firefox extension specifically designed for improving your YouTube video watching experience. By default, YouTube uses VP8/VP9 encoding for its videos, which can put undue stress on less potent machines leading to stuttering videos and high CPU usage. The h264ify add-on intervenes to make YouTube stream H.264 encoded videos, a format more often hardware-accelerated by GPUs, thereby enabling smooth playback and lower CPU usage.

Version: 1.1.0 (Last updated: 2019-09-09)
Creation date: 2015-02-17
Weekly download count: 882
Firefox on Android: Yes
Risk impact: High risk impact
Risk likelihood: Low risk likelihood
Manifest version: 2
  • storage
Size: 35.79K
URLs: Website
Stats date:

Other platforms

h264ify (v1.1.0)
4.56 (1,116) 1,142,244
h264ify (v1.1.0)
4.60 (24) 142,617
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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. h264ify makes YouTube stream H.264 videos instead of VP8/VP9 videos.

Github: https://github.com/erkserkserks/h264ify

User reviews
User reviews summary
These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
  • Improves video fluidity and reduces lag on YouTube
  • Enables smoother video streaming on low-resource PCs
  • Reduces high CPU usage caused by YouTube
  • Some users report that it doesn't work or YouTube still lags
  • Removes settings for video quality above 1080p, like 4K
  • Concerns about privacy and security due to permissions
Most mentioned
  • Makes videos smooth and reduces lag
  • Limits video quality to a maximum of 1080p
  • May be abandoned by its author
  • Reduces CPU usage
  • Privacy concerns raised by a reviewer
View all user reviews
Risk impact

h264ify is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install h264ify if you trust the publisher.

Risk likelihood

h264ify has earned a fairly good reputation and likely can be trusted.

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