Firefox コミュニティフォーラム

I have noticed that since around Friday, April 24th, 2026, that Youtube videos will sometimes refuse to load properly. The page for the video will come up, but buttons on the page will not load, and nor will the video. This started happening around mid-day, when prior to it, things had been fine. At first I thought it might be tied into the 'ambient mode' option on Youtube itself., But even after shutting that off, I found it was still happening at ranodm.

Is this something new Yotube is doing in their continued (idiotic) fight against ad blockers, or is there an actual glitch in the browser or, more likely, a glitch in Youtube? Like I said, this seems to occur at random and I can't trace the cause for it. I'll include a screenshot of what I'm seeing. But if anyone knows what's happening here, I'd appreciate it.

I should add that I am on Windows 11 and using the new version 150.0 for Firefox. (Congrats on that, by the way.)

I'll be honest, I keep hearing some other browser can block youtube ads innately. (Brave, I think it was called?) and while the idea is cool, I'm not giving up a browser I've used for over 20 years for it. If Firefox can find a way to implement a similar means of blocking Youtube ads innately, I;d love it. But for now, I just wanna know what the devil is happening with the site. Can anyone help?

Settings for font do not help. Font now looks very thin and almost blurry. Not clear, dark lines like always in the past.

My setting are Arial size 16. Under advanced, it show Arial Monospace size 13.

I've just opened one simple Web site (in addition to Mozilla), and already CPU usage sits at about 20%! Please refer to my recent posts here at "Why is Firefox Suddenly Taking Over my CPU?" for the problem description. I'm re-posting simply in hopes that I can "send data" on this one from outside my sandbox. Regards -- jclarkw

What happened: 1) I wanted to create a Passkey for a website and store it in Bitwarden. 2) Bitwarden pop-up opened, but while exploring the options, I accidentally clicked on the option "Use your device or hardware key: Always for this website". 3) Windows Defender dialog popped up with the options "iPhone, iPad or Android device" and "Security key" 4) I backed out of the dialog window 5) I clicked the button to create a Passkey again but going forward only the Windows Defender pop-up appears

The problem: I now cannot create a Passkey to store in Bitwarden on a specific website, because I accidentally clicked on "Use your device or hardware key: Always for this website".

What I've tried that didn't work: - looking through Bitwarden settings - deleting Firefox cookies - doing the same thing in Private Browsing - asking AI and looking through about:config, about:preferences and about:logins, as well as trying to find profile files related to webauth

Found workaround: - creating the Passkey from a different Mozilla profile

I would still very much like to be able to undo the "Always for this website". Is there a way to do that? (Attached images were captured later when recreating the situation.)

"Login" button does not respond to click after "Login ID" and "Password" input anymore after Apr 21 on Firefox.. Unable to access emails. https://login.netvigator.com/ Can access same website from Chrome on mini iPad or same notebook though.. How can I resolve the problem on Firefox?? Thank you.

I have configured advance tracking protection and set all variables to true in the configuration editor except "privacy.resistFingerprinting.jsmloglevel" which is set to "warn". I still have a unique fingerprint. Other than starting over is there anything else I can do?

Hello

After update to FF 150.0 I have an issue I can't solve myself. My old theme that I was using for many, many years changed colours, because now frame colour corresponds to whatever FF uses dark theme or light theme for some panels like bookmarks, bookmarks editor e.t.c ( I assume it). So if frame is dark all other elements switch to dark mode. I`m looking for a way to change it back to how it was before FF 150.0, meaning if frame is dark I want all rest element of FF to become light themed. For instance: in manifest.json if "frame": "rgb(31, 34, 60)", everything else turn dark if "frame": "rgb(131, 134, 160)", everything else turns light Default themes won't work for me ( v.bad eyesight ) Is there any entry I can add to manifest.json to get what I want? I mean: if "frame": "rgb(31, 34, 60)", I need everything to use LIGHT themed colours.

I updated both of my laptops to the latest version and now I cannot upload files to https://cloud.nordlocker.com (NordVPN Cloud). Had no issues on the previous version. I get the following - Gah. Your tab just crashed. We can help! Choose Restore This Tab to reload the page. (Screenshot attached). I have tried both restore and close and restarted laptop. I have to use Edge to upload files.

I am no longer able to use my ai apps, like chatgpt or claude.ai because firefox will no longer allow me to upload docs or images. This is a new problem, though I have not changed any of my settings.

Today Firefox has suddenly started using ~20% of my CPU capacity, causing my cooling fan to run high most of the time. Since I had been running Firefox v.149.latest, I tried updating to v.150.0, but that made no difference.

It's not Firefox by itself (only Task Manager open) but whenever I open another tab with almost any website (including this one) that CPU usage spikes. What gives?!

Details: Running under Windows 10 Pro (yes, I have installed the ESU package, good until thi8s fall) on a Lenovo P1 Gen 2. Currently running Firefox inside a Sandboxie Pro v1.17.4 sandbox.

Please Help! -- jclarkw

Hi,

Please guide me. Dailymotion stream not running on Firefox but works on Chrome. I uninstall firefox and reinstall it fresh but problem still exist. The player play for like 2 seconds and then screen turn blank. I am using Windows 11 and using latest firefox version. Thank You

Very often, when I hover over my tab group, the list of tabs inside it doesn't expand so I can quickly navigate to it. I have to completely restart the browser, which is inconvenient. And I no longer want to use a special extension for permanent pinning. Please fix this, developers.

I'm experiencing an issue with the latest Firefox update. If I refresh a link/page the browser "spins out" in a rapid endless refresh cycle. In some cases, I receive an error message, "too many requests," and in other cases, the browser "locks up" and quits responding at all.

Is this a known issue?

Vince C.

Starting a couple of weeks ago I haven't been able to open PDFs in my Firefox browser. Although there are other pdf viewers, Firefox has features that I use that the others don't. I've tried all the various ideas I've found elsewhere online but none worked. I submitted a ticket to our IT helpdesk, but they say it's a Mozilla Firefox issue. The error message isn't helpful at all, considering there is no web server involved.

I get the error below:

Access to the file was denied

Firefox can’t connect to the server at local file What can you do about it?

The issue is most likely with the website, and there is nothing you can do to resolve it. You can notify the website’s administrator about the problem.