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正體中文

Why do some YouTube videos make the browser freeze, the computer heat up, and the cooling fans spin like it's about to take off? It's possible that the video selected a codec that your computer doesn't support.

This is a Firefox extension that can select video codecs for YouTube. Force to play YouTube videos with H.264 (AVC), VP9, and AV1 codec.

Install

Glance

Screenshot

Features

  • Optional select the codecs which want to block, AVC, VP8, VP9, and AV1.
  • Optional block 60 FPS.
  • Dark UI;
  • Language support: English, Chinese (Taiwan).

⚠️ If you block all codecs, YouTube will tell you "Your browser can't play this video.", it works as expected.

To enforce AV1, Options VP9 and AV1 need to be allowed (unchecked). the reason is unknown.

Sometimes, a hard reflash is required, i.e. Ctrl + F5.

Why YourCodecs?

YouTube consistently leverages cutting-edge technologies. From AVC to VP8, VP9, and now AV1, its latest video compression codec promises enhanced performance and quality compression. However, encountering a video with a codec unsupported by your hardware (GPU) leads to software decoding, significantly taxing CPU resources. This can result in overheating, sluggish performance, and reduced battery life, particularly on "older" devices. While YouTube typically automatically selects the codec for you, it may not always be your wish.

Which Codec did I get?

Right-click the youtube player, select "Stats for nerds". You will see "Codecs" for both video and audio. VP9, AV1 may be marks start with VP09, AV01.

Does My Hardware Support The New Codecs?

Determining whether your hardware supports the latest codecs can be approached in several ways. One method is to search for the specifications of your device online. Alternatively, you can inspect the "Task Manager" while playing a video on YouTube. If your hardware is compatible with the codec being used, you should observe an increase in the "Video Encode engine" graph during playback.

License

The codes modify (fork) from erkserkserks/h264ify, released under MIT Licence.

And the modified version is still released under MIT Licence.

Reference

Remarks

  • The UserScript Version does not work with GreaseMonkey, but ViolentMonkey does work.
  • I can't test the VP8 option because I can't find any video that still uses VP8, but it should work.

About

A Firefox extension can select to force the YouTube stream videos with H.264 (AVC) VP9, AV1 codecs.

addons.mozilla.org/firefox/addon/your-codecs/

Topics

firefox-extensionyoutube

Resources

Readme
MIT license
Activity

Stars

25 stars

Watchers

0 watching

Forks

0 forks
Report repository

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
Repository files navigation
icon YourCodecs
正體中文
Why do some YouTube videos make the browser freeze, the computer heat up, and the cooling fans spin like it's about to take off? It's possible that the video selected a codec that your computer doesn't support.
This is a Firefox extension that can select video codecs for YouTube. Force to play YouTube videos with H.264 (AVC), VP9, and AV1 codec.
Install
Glance
Screenshot
Features
  • Optional select the codecs which want to block, AVC, VP8, VP9, and AV1.
  • Optional block 60 FPS.
  • Dark UI;
  • Language support: English, Chinese (Taiwan).
⚠️ If you block all codecs, YouTube will tell you "Your browser can't play this video.", it works as expected.
To enforce AV1, Options VP9 and AV1 need to be allowed (unchecked). the reason is unknown.
Sometimes, a hard reflash is required, i.e. Ctrl + F5.
Why YourCodecs?
YouTube consistently leverages cutting-edge technologies. From AVC to VP8, VP9, and now AV1, its latest video compression codec promises enhanced performance and quality compression. However, encountering a video with a codec unsupported by your hardware (GPU) leads to software decoding, significantly taxing CPU resources. This can result in overheating, sluggish performance, and reduced battery life, particularly on "older" devices. While YouTube typically automatically selects the codec for you, it may not always be your wish.
Which Codec did I get?
Right-click the youtube player, select "Stats for nerds". You will see "Codecs" for both video and audio. VP9, AV1 may be marks start with VP09, AV01.
Does My Hardware Support The New Codecs?
Determining whether your hardware supports the latest codecs can be approached in several ways. One method is to search for the specifications of your device online. Alternatively, you can inspect the "Task Manager" while playing a video on YouTube. If your hardware is compatible with the codec being used, you should observe an increase in the "Video Encode engine" graph during playback.
License
The codes modify (fork) from erkserkserks/h264ify, released under MIT Licence.
And the modified version is still released under MIT Licence.
Reference
Remarks
  • The UserScript Version does not work with GreaseMonkey, but ViolentMonkey does work.
  • I can't test the VP8 option because I can't find any video that still uses VP8, but it should work.
About
A Firefox extension can select to force the YouTube stream videos with H.264 (AVC) VP9, AV1 codecs.
addons.mozilla.org/firefox/addon/your-codecs/
Topics
firefox-extensionyoutube
Resources
Readme
MIT license
Activity
Stars
25 stars
Watchers
0 watching
Forks
0 forks
Report repository
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
icon YourCodecs
正體中文
Why do some YouTube videos make the browser freeze, the computer heat up, and the cooling fans spin like it's about to take off? It's possible that the video selected a codec that your computer doesn't support.
This is a Firefox extension that can select video codecs for YouTube. Force to play YouTube videos with H.264 (AVC), VP9, and AV1 codec.
Install
Glance
Screenshot
Features
  • Optional select the codecs which want to block, AVC, VP8, VP9, and AV1.
  • Optional block 60 FPS.
  • Dark UI;
  • Language support: English, Chinese (Taiwan).
⚠️ If you block all codecs, YouTube will tell you "Your browser can't play this video.", it works as expected.
To enforce AV1, Options VP9 and AV1 need to be allowed (unchecked). the reason is unknown.
Sometimes, a hard reflash is required, i.e. Ctrl + F5.
Why YourCodecs?
YouTube consistently leverages cutting-edge technologies. From AVC to VP8, VP9, and now AV1, its latest video compression codec promises enhanced performance and quality compression. However, encountering a video with a codec unsupported by your hardware (GPU) leads to software decoding, significantly taxing CPU resources. This can result in overheating, sluggish performance, and reduced battery life, particularly on "older" devices. While YouTube typically automatically selects the codec for you, it may not always be your wish.
Which Codec did I get?
Right-click the youtube player, select "Stats for nerds". You will see "Codecs" for both video and audio. VP9, AV1 may be marks start with VP09, AV01.
Does My Hardware Support The New Codecs?
Determining whether your hardware supports the latest codecs can be approached in several ways. One method is to search for the specifications of your device online. Alternatively, you can inspect the "Task Manager" while playing a video on YouTube. If your hardware is compatible with the codec being used, you should observe an increase in the "Video Encode engine" graph during playback.
License
The codes modify (fork) from erkserkserks/h264ify, released under MIT Licence.
And the modified version is still released under MIT Licence.
Reference
Remarks
  • The UserScript Version does not work with GreaseMonkey, but ViolentMonkey does work.
  • I can't test the VP8 option because I can't find any video that still uses VP8, but it should work.
About
A Firefox extension can select to force the YouTube stream videos with H.264 (AVC) VP9, AV1 codecs.
addons.mozilla.org/firefox/addon/your-codecs/
Topics
firefox-extensionyoutube
Resources
Readme
MIT license
Activity
Stars
25 stars
Watchers
0 watching
Forks
0 forks
Report repository
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
icon YourCodecs
正體中文
Why do some YouTube videos make the browser freeze, the computer heat up, and the cooling fans spin like it's about to take off? It's possible that the video selected a codec that your computer doesn't support.
This is a Firefox extension that can select video codecs for YouTube. Force to play YouTube videos with H.264 (AVC), VP9, and AV1 codec.
Install
Glance
Screenshot
Features
  • Optional select the codecs which want to block, AVC, VP8, VP9, and AV1.
  • Optional block 60 FPS.
  • Dark UI;
  • Language support: English, Chinese (Taiwan).
⚠️ If you block all codecs, YouTube will tell you "Your browser can't play this video.", it works as expected.
To enforce AV1, Options VP9 and AV1 need to be allowed (unchecked). the reason is unknown.
Sometimes, a hard reflash is required, i.e. Ctrl + F5.
Why YourCodecs?
YouTube consistently leverages cutting-edge technologies. From AVC to VP8, VP9, and now AV1, its latest video compression codec promises enhanced performance and quality compression. However, encountering a video with a codec unsupported by your hardware (GPU) leads to software decoding, significantly taxing CPU resources. This can result in overheating, sluggish performance, and reduced battery life, particularly on "older" devices. While YouTube typically automatically selects the codec for you, it may not always be your wish.
Which Codec did I get?
Right-click the youtube player, select "Stats for nerds". You will see "Codecs" for both video and audio. VP9, AV1 may be marks start with VP09, AV01.
Does My Hardware Support The New Codecs?
Determining whether your hardware supports the latest codecs can be approached in several ways. One method is to search for the specifications of your device online. Alternatively, you can inspect the "Task Manager" while playing a video on YouTube. If your hardware is compatible with the codec being used, you should observe an increase in the "Video Encode engine" graph during playback.
License
The codes modify (fork) from erkserkserks/h264ify, released under MIT Licence.
And the modified version is still released under MIT Licence.
Reference
Remarks
  • The UserScript Version does not work with GreaseMonkey, but ViolentMonkey does work.
  • I can't test the VP8 option because I can't find any video that still uses VP8, but it should work.
About
A Firefox extension can select to force the YouTube stream videos with H.264 (AVC) VP9, AV1 codecs.
addons.mozilla.org/firefox/addon/your-codecs/
Topics
firefox-extensionyoutube
Resources
Readme
MIT license
Activity
Stars
25 stars
Watchers
0 watching
Forks
0 forks
Report repository
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
icon YourCodecs
正體中文
Why do some YouTube videos make the browser freeze, the computer heat up, and the cooling fans spin like it's about to take off? It's possible that the video selected a codec that your computer doesn't support.
This is a Firefox extension that can select video codecs for YouTube. Force to play YouTube videos with H.264 (AVC), VP9, and AV1 codec.
Install
Glance
Screenshot
Features
  • Optional select the codecs which want to block, AVC, VP8, VP9, and AV1.
  • Optional block 60 FPS.
  • Dark UI;
  • Language support: English, Chinese (Taiwan).
⚠️ If you block all codecs, YouTube will tell you "Your browser can't play this video.", it works as expected.
To enforce AV1, Options VP9 and AV1 need to be allowed (unchecked). the reason is unknown.
Sometimes, a hard reflash is required, i.e. Ctrl + F5.
Why YourCodecs?
YouTube consistently leverages cutting-edge technologies. From AVC to VP8, VP9, and now AV1, its latest video compression codec promises enhanced performance and quality compression. However, encountering a video with a codec unsupported by your hardware (GPU) leads to software decoding, significantly taxing CPU resources. This can result in overheating, sluggish performance, and reduced battery life, particularly on "older" devices. While YouTube typically automatically selects the codec for you, it may not always be your wish.
Which Codec did I get?
Right-click the youtube player, select "Stats for nerds". You will see "Codecs" for both video and audio. VP9, AV1 may be marks start with VP09, AV01.
Does My Hardware Support The New Codecs?
Determining whether your hardware supports the latest codecs can be approached in several ways. One method is to search for the specifications of your device online. Alternatively, you can inspect the "Task Manager" while playing a video on YouTube. If your hardware is compatible with the codec being used, you should observe an increase in the "Video Encode engine" graph during playback.
License
The codes modify (fork) from erkserkserks/h264ify, released under MIT Licence.
And the modified version is still released under MIT Licence.
Reference
Remarks
  • The UserScript Version does not work with GreaseMonkey, but ViolentMonkey does work.
  • I can't test the VP8 option because I can't find any video that still uses VP8, but it should work.
About
A Firefox extension can select to force the YouTube stream videos with H.264 (AVC) VP9, AV1 codecs.
addons.mozilla.org/firefox/addon/your-codecs/
Topics
firefox-extensionyoutube
Resources
Readme
MIT license
Activity
Stars
25 stars
Watchers
0 watching
Forks
0 forks
Report repository
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
icon YourCodecs
正體中文
Why do some YouTube videos make the browser freeze, the computer heat up, and the cooling fans spin like it's about to take off? It's possible that the video selected a codec that your computer doesn't support.
This is a Firefox extension that can select video codecs for YouTube. Force to play YouTube videos with H.264 (AVC), VP9, and AV1 codec.
Install
Glance
Screenshot
Features
  • Optional select the codecs which want to block, AVC, VP8, VP9, and AV1.
  • Optional block 60 FPS.
  • Dark UI;
  • Language support: English, Chinese (Taiwan).
⚠️ If you block all codecs, YouTube will tell you "Your browser can't play this video.", it works as expected.
To enforce AV1, Options VP9 and AV1 need to be allowed (unchecked). the reason is unknown.
Sometimes, a hard reflash is required, i.e. Ctrl + F5.
Why YourCodecs?
YouTube consistently leverages cutting-edge technologies. From AVC to VP8, VP9, and now AV1, its latest video compression codec promises enhanced performance and quality compression. However, encountering a video with a codec unsupported by your hardware (GPU) leads to software decoding, significantly taxing CPU resources. This can result in overheating, sluggish performance, and reduced battery life, particularly on "older" devices. While YouTube typically automatically selects the codec for you, it may not always be your wish.
Which Codec did I get?
Right-click the youtube player, select "Stats for nerds". You will see "Codecs" for both video and audio. VP9, AV1 may be marks start with VP09, AV01.
Does My Hardware Support The New Codecs?
Determining whether your hardware supports the latest codecs can be approached in several ways. One method is to search for the specifications of your device online. Alternatively, you can inspect the "Task Manager" while playing a video on YouTube. If your hardware is compatible with the codec being used, you should observe an increase in the "Video Encode engine" graph during playback.
License
The codes modify (fork) from erkserkserks/h264ify, released under MIT Licence.
And the modified version is still released under MIT Licence.
Reference
Remarks
  • The UserScript Version does not work with GreaseMonkey, but ViolentMonkey does work.
  • I can't test the VP8 option because I can't find any video that still uses VP8, but it should work.
About
A Firefox extension can select to force the YouTube stream videos with H.264 (AVC) VP9, AV1 codecs.
addons.mozilla.org/firefox/addon/your-codecs/
Topics
firefox-extensionyoutube
Resources
Readme
MIT license
Activity
Stars
25 stars
Watchers
0 watching
Forks
0 forks
Report repository
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
icon YourCodecs
正體中文
Why do some YouTube videos make the browser freeze, the computer heat up, and the cooling fans spin like it's about to take off? It's possible that the video selected a codec that your computer doesn't support.
This is a Firefox extension that can select video codecs for YouTube. Force to play YouTube videos with H.264 (AVC), VP9, and AV1 codec.
Install
Glance
Screenshot
Features
  • Optional select the codecs which want to block, AVC, VP8, VP9, and AV1.
  • Optional block 60 FPS.
  • Dark UI;
  • Language support: English, Chinese (Taiwan).
⚠️ If you block all codecs, YouTube will tell you "Your browser can't play this video.", it works as expected.
To enforce AV1, Options VP9 and AV1 need to be allowed (unchecked). the reason is unknown.
Sometimes, a hard reflash is required, i.e. Ctrl + F5.
Why YourCodecs?
YouTube consistently leverages cutting-edge technologies. From AVC to VP8, VP9, and now AV1, its latest video compression codec promises enhanced performance and quality compression. However, encountering a video with a codec unsupported by your hardware (GPU) leads to software decoding, significantly taxing CPU resources. This can result in overheating, sluggish performance, and reduced battery life, particularly on "older" devices. While YouTube typically automatically selects the codec for you, it may not always be your wish.
Which Codec did I get?
Right-click the youtube player, select "Stats for nerds". You will see "Codecs" for both video and audio. VP9, AV1 may be marks start with VP09, AV01.
Does My Hardware Support The New Codecs?
Determining whether your hardware supports the latest codecs can be approached in several ways. One method is to search for the specifications of your device online. Alternatively, you can inspect the "Task Manager" while playing a video on YouTube. If your hardware is compatible with the codec being used, you should observe an increase in the "Video Encode engine" graph during playback.
License
The codes modify (fork) from erkserkserks/h264ify, released under MIT Licence.
And the modified version is still released under MIT Licence.
Reference
Remarks
  • The UserScript Version does not work with GreaseMonkey, but ViolentMonkey does work.
  • I can't test the VP8 option because I can't find any video that still uses VP8, but it should work.
About
A Firefox extension can select to force the YouTube stream videos with H.264 (AVC) VP9, AV1 codecs.
addons.mozilla.org/firefox/addon/your-codecs/
Topics
firefox-extensionyoutube
Resources
Readme
MIT license
Activity
Stars
25 stars
Watchers
0 watching
Forks
0 forks
Report repository
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Why do some YouTube videos make the browser freeze, the computer heat up, and the cooling fans spin like it's about to take off? It's possible that the video selected a codec that your computer doesn't support.
This is a Firefox extension that can select video codecs for YouTube. Force to play YouTube videos with H.264 (AVC), VP9, and AV1 codec.
Install
Glance
Screenshot
Features
  • Optional select the codecs which want to block, AVC, VP8, VP9, and AV1.
  • Optional block 60 FPS.
  • Dark UI;
  • Language support: English, Chinese (Taiwan).
⚠️ If you block all codecs, YouTube will tell you "Your browser can't play this video.", it works as expected.
To enforce AV1, Options VP9 and AV1 need to be allowed (unchecked). the reason is unknown.
Sometimes, a hard reflash is required, i.e. Ctrl + F5.
Why YourCodecs?
YouTube consistently leverages cutting-edge technologies. From AVC to VP8, VP9, and now AV1, its latest video compression codec promises enhanced performance and quality compression. However, encountering a video with a codec unsupported by your hardware (GPU) leads to software decoding, significantly taxing CPU resources. This can result in overheating, sluggish performance, and reduced battery life, particularly on "older" devices. While YouTube typically automatically selects the codec for you, it may not always be your wish.
Which Codec did I get?
Right-click the youtube player, select "Stats for nerds". You will see "Codecs" for both video and audio. VP9, AV1 may be marks start with VP09, AV01.
Does My Hardware Support The New Codecs?
Determining whether your hardware supports the latest codecs can be approached in several ways. One method is to search for the specifications of your device online. Alternatively, you can inspect the "Task Manager" while playing a video on YouTube. If your hardware is compatible with the codec being used, you should observe an increase in the "Video Encode engine" graph during playback.
License
The codes modify (fork) from erkserkserks/h264ify, released under MIT Licence.
And the modified version is still released under MIT Licence.
Reference
Remarks
  • The UserScript Version does not work with GreaseMonkey, but ViolentMonkey does work.
  • I can't test the VP8 option because I can't find any video that still uses VP8, but it should work.
About
A Firefox extension can select to force the YouTube stream videos with H.264 (AVC) VP9, AV1 codecs.
addons.mozilla.org/firefox/addon/your-codecs/
Topics
firefox-extensionyoutube
Resources
Readme
MIT license
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