Reviews of h264ify

By: erkserkserks Add-on

List of user reviews and ratings for h264ify

Total ratings

4.41 (Rating count: 231)

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Review summary

Users praise h264ify for boosting performance on older machines by reducing CPU/RAM load and enabling hardware-accelerated H.264 on YouTube. It can help counteract AV1 usage by favoring older codecs. However, it can hide higher resolutions (2K/4K) and block VP8/VP9, which some dislike. The add-on may require manual config changes and restarts, and its lack of recent updates poses compatibility questions. Overall, a helpful tool for legacy setups with notable trade-offs.

Pros

Improves playback performance on older GPUs/CPUs, reducing lag and CPU/RAM usage.
Enables hardware-accelerated H.264 (AVC1) decoding for YouTube on older hardware.
Helps avoid YouTube's AV1 dominance by prioritizing older codecs (H.264/VP8/VP9) when possible.
Remains functional on long-ago maintained versions, providing value for legacy setups.

Cons

Disables higher resolutions above 1080p (e.g., 2K/4K) in some cases, reducing video quality options.
Blocks VP8/VP9 codecs, which can degrade quality or limit certain videos that rely on those formats.
Often requires manual tweaks (about:config) or a Firefox restart to apply changes.
Not updated for years (last around 6 years), raising potential compatibility concerns.

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User Reviews

Recent rating average: 4.40

All time rating average: 4.41

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8% (17)

Date	Author	Comment
2026-05-01	Gr*****

2026-04-12	fl*****

2026-03-24	Te*****

2026-03-07	Fi*****	Działa prawidłowo. Po zmianie ustawień z reguły wymaga wyłączenia i włączenia firefoxa aby załapało. Dla starszych GPU i CPU z iGPU ten dodatek jest świetny. Na Atomie X5 w końcu youtube działa ze sprzętową akceleracją AVC1 (H.264).
Działa prawidłowo. Po zmianie ustawień z reguły wymaga wyłączenia i włączenia firefoxa aby załapało. Dla starszych GPU i CPU z iGPU ten dodatek jest świetny. Na Atomie X5 w końcu youtube działa ze sprzętową akceleracją AVC1 (H.264).
2026-02-16	An*****

2026-02-12	Lu*****	does't work, doesn't do anything
does't work, doesn't do anything
2026-01-22	Ir*****

2025-12-24	Ko*****	Last update 6 years ago but it still works and it's become more needed than ever now that YouTube is defaulting to a super low bitrate AV1 that looks god awful. thank you, wherever you are The downside is this also disables resolutions higher than 1080p. So we have to choose between uglier 140p - 1080p videos or no 1440p+. Ugh
Last update 6 years ago but it still works and it's become more needed than ever now that YouTube is defaulting to a super low bitrate AV1 that looks god awful. thank you, wherever you are The downside is this also disables resolutions higher than 1080p. So we have to choose between uglier 140p - 1080p videos or no 1440p+. Ugh
2025-11-07	Be*****	YouTube now defaults to AV1. The extension was last updated 6 years ago, so it still only blocks VP8/VP9. EDIT: After changing this setting to false in about:config it works: media.av1.enabled
YouTube now defaults to AV1. The extension was last updated 6 years ago, so it still only blocks VP8/VP9. EDIT: After changing this setting to false in about:config it works: media.av1.enabled
2025-10-23	Se*****