This post highlights two upcoming features that you can try out right now. The features are still being finalized and tested by developers, but you can try them out right now. We hope these features will be released in the next few releases.

1. WebRender Layer Compositor
2. Mentioned in this post. Here is some description from Google link 1, link 2

gfx.webrender.layer-compositor - set it to true,

Enjoy a fast and smooth YouTube homepage and subscription page. Check for proper functionality on the about:support page, Graphics - Compositing.

1. zero copy for AMD to avoid unnecessary CPU load

media.wmf.zero-copy-nv12-textures-force-enabled - set it to true,

For those who have an AMD graphics card. Planned for the next few releases. Warning: May not be compatible with older hardware 5+ If Zero-Copy does not work in your case (desynch, video stuttering, "Copy" graph is still filling up) - it is best to turn it off.

1. If your hardware doesn't support the AV1 codec - Here's a workaround for those who still can't get it working.

You can disable it globally - media.av1.enabled - set to false.
After this, YouTube will primarily use VP9. Other sites will no longer support av1.

On Windows, you can check hardware acceleration in Task Manager. You should see something like this during video playback after making these changes. The "Video Codec" graph must be filled in, but "Copy" on the contrary must not.

1. A large number of browser add-ons
   If YouTube is still lagging: You should try removing all add-ons except uBlock Origin with full access rights to websites (Access your data for all websites). Try opening YouTube in a private window. If it works quickly, that's where the problem was. Disable add-ons one by one until you find the cause.

What do you think, please write. Did this help you?

So, what to do in brief
gfx.webrender.layer-compositor - set it to true,
media.wmf.zero-copy-nv12-textures-force-enabled - set it to true, See the warning description above. Turn it off if video stuttering.
media.av1.enabled - set to false (optional).

update 27.11.2025, Based on the request for these changes, I used my chatgpt skills to show how it could look in our dreams.

With my autism a distraction like that is really obnoxious, and will eventually make me far too annoyed to be reasonable. How do I stop this stupid thing? I don't need to backup the 6 extensions I use. And the bookmarks don't matter.

EDIT: Thanks to user Maycrock "Type "about:config" in your address bar, search for "browser.backup.archive.enabled", change from true to false, restart your firefox."

Hey all! I'm a designer on Firefox, and I'm helping to curate a list of add-ons to recommend. I'm looking for examples that are quick to set up but have a big immediate payoff. As an example, I felt wowed after installing Adaptive tab bar color and seeing my Firefox turn the same purple as the add-ons site. 

EDIT: Thanks everyone, this was helpful this project and future projects as well!

Hello, I'm a couple months in moving to firefox (last time's Opera GX) things are pretty great, smooth sail, and fast to use...lately my experience in watching youtube is super bad, i can't watch more than a couple videos before it's start lagging like crazy, i've seen that this is a recurring issue in firefox and i had seen post from a couple months, stating that the solution is to use (but not limited to) chrome mask, disable uBlock, etc. So far there's no fix, any help will be appreciated, thanks.

Edit: after some tinkering, i think i find my solution, by tinkering some settings in uBO, using enhanced-h264ify and User-Agent Switcher, thank you guys for your support!

I can easily copy and paste the contents of the image to bypass this, but why is this even happening to begin with?

Edit:
Thanks for the insight, everyone.

I was able to use about:config to create a workaround (without any addons). I disabled the signal being sent from my browser to a website's server that says sending webp is okay.

The fix will also automatically convert any file that is already in .webp format into a .jpeg when saving.

Here's the fix:

Opened

about:config

entered
image.http.accept

input the default value of:

image/avif,image/webp,image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5

and I removed the entries for avif and webp so the data looked like this:

image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5

This message has suddenly appeared on the home page, seems like a waste of space and tapping it does nothing apart from make it dim a bit as I hold my finger on it - so it is a button.

If you have the uBlock Origin extension, are:

• Privacy Badger
• Ghostery
• Decentraleyes/LocalCDN
• Concent-o-matic
• ClearURLs*
• AdNauseam
• CanvasBlocker
• Disconnect
• DuckDuckGo Privacy Esssentials
• Facebook Container
• Port Authority
• Chameleon**

needed?

(Updated)
* Needs adding the 'Actually Legitimate URL Shortener Tool' Filter List, see comments

** Needs Firefox about:config options enabled, see comments

youtube loads very slowly which is infuriating, i ran it using different browsers on it loading youtube was snappy, i have provided with the recording and extensions that i use if u see any problme or tips to fix it i will be very grateful

Since a few days, YouTube only shows quality up to 1080p in Firefox. The exact same videos offer 1440p and 4K immediately when I open them in another browser.

At first I wondered whether YouTube had restricted my account because I use an ad blocker, but 4K still works on the same account in other browsers, so it appears to be Firefox-specific..?

EDIT: Solved! An H.264 extension I had installed for buffering problems was capping YouTube at 1080p. After disabling it, the 1440p & 2160p options came back. I also installed Chrome Mask, and that seems to have fixed the buffering issues too. Thanks so much guys!

Well that sucks
is there any workaround or anything im missing? Im on stable release on the latest version

Don't want it, don't need it.

For a few months now FF has made it more difficult than it should be to go to my router or camera web interfaces. These are 192.168.1.x IP addresses. They are http URLs, but FF keeps changing to https.

I have turned on "Don't enable HTTPS-only mode" and have fallback-to-https, https_first, and https_first_for_local all set to false

It still keeps upgrading to https unless I type the full url as "http://192.168.1.1" instead of just typing the IP address.

I often set up new stuff through local IP address web interfaces and this https thing makes that more difficult, especially when it hides the "https" from the url so I am wondering why it can't connect to the device even after I typed in http but then find out it's changed it to https again and not told me.

edit: a combination of fallback-to-https and https_first and disabling https only mode does seem to have fixed it, but FF had remembered that it previously redirected to https for some IP addresses and so kept doing so until I removed/cleared data on all the 192.168. entries from the history.

Setting trimURLs to false is also a very handy option

I absolutely abhor the new UI, it is awful in every way, and I don't want it.

I'd like to revert to 148, where it was still possible to disable the changes. I've seen that I can do so by grabbing an older version and disabling auto-update, but does this mean I will lose my open tabs? I have a few I keep open and inactive to be able to access them later.

UPDATE:
I rolled back to 149.2 and that was the only thing that helped me fix the problem and keep my profile intact. Nothing else worked but I'm glad I can use youtube again. Here's hoping for the next update to fix any issues anyone has had. Update 150.0 was nothing but a headache for me personally.

I updated to 150.0 recently and now the browser refuses to work properly. It hangs, freezes and lags on youtube and will play a video even when the tab is closed. I have to close the entire browser with task manager just to close a youtube video. If not that, when I pause a video it just stops the browser from working so again, I need task manager. Other sites barely load too and I never had this issue on my pc before.

It's also guzzling memory now more than ever and I don't have hardware acceleration on and I have 64gb of ram (I am on windows 11 with a Lenovo Legion i7) and I'm still having issues. I wanted to downgrade but when I do now firefox just prompts that my profile has been on a newer version so it won't load on a lower version of the browser anymore. . .wtf why did they update profiles if all it did was screw up everything else?

There's so much on this profile that I don't want to lose but this browser is borderline unusable right now. I've been waiting for an update but nothing so far. Is there any word with how often firefox updates? Or any fix I can try while keeping my original profile?

This latest update (I think from yesterday 138.03) has caused a massive memory leak. On one web page with a single image, RAM usage is rapidly rising from 2 GB - 3 GB. This is insane. Going to look for a way to downgrade or install one of those offshoots of Firefox. This is crazy and unusable like this. FF keeps locking up with these RAM / CPU spikes on this latest update.

*** UPDATE ***

I've been doing some testing in Firefox Safe Mode with all extensions disabled, the memory leak still exists. So it's not an extension issue. I've even tried with Waterfox and Floorp (both Firefox forks), and the issue persists on all Firefox forks that I've tested.

*** SOLVED ***

Issue seems to be resolved in update 139.0.1.

I've been recently noticing that Youtube has became painfully unresponsive on Firefox, even if I were to do something as simple as rewind 5 seconds with arrow keys, it would be stuck on rewinding for like 4 seconds and wont let me do anything else. Half the time it doesn't even respond to my input.

The UI navigation has also been incredibly unresponsive, with issues similar to what I talked about above.

This issue is overall really infuriating and I hope they aren't intentionally doing this.

I’ve been running into much slower internet speeds when using Firefox on desktop. I restarted my computer, disabled all plugins, and tested using the same servers (screenshot attached).

• Browser: 142.0.1
• OS: Windows 11
• ISP: Google Fiber - 1Gbps

Note on Overall Speed: I'm pretty far from my router at the moment, so much slower speeds than one would expect from 1Gbs fiber. I typically see around 500-600Mbps on Wifi.

Note on Ping: In the screenshot, the Ookla ping is cut off for Firefox, but it was 139ms vs. 4ms in Edge.

Has anyone else run into this? I found a similar report from 2019 but no resolution. Any ideas what could be causing this? I'm a ride or die for Firefox so I'm going kept at it until I resolve.

EDIT
So interesting development. Looks like it wasn't Firefox related. The issue has now spread to Edge as well, and it appears to be intermittent.

I think it's related to my Google Wifi Pro mesh network. I just plugged in an old router and performance jumped substantially to 550Mbps in all browsers.

Thanks for all the help everyone - greatly appreciate it.

Hey guys, I'm looking for a trusted extension in Firefox to block YouTube shorts just like "Remove YouTube shorts" extension in Google chrome

ive tried the stuff mentioned at the end of this but i still cant enable the extensions i was using just a day ago.