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I wanted to use the new VPN feature and the icon initially showed up in the top right, but it has disappeared and is not present in "customise toolbar" or privacy settings either.

I used to be able to clink on an image link prior to a Firefox update (I don't know which one) to go to that site. Firefox gives me that it cannot find the server. What can I do to correct this problem?

Hello. Yesterday, I deleted all the stored login information, such as cookies. Latter, I tried to make login, I filled my name and password. As usual, Facebook refuses to login, giving me a choice of extra steps necessary. I chosen to receive a security code on my e-mail. I copy and pasted it on the suitable place and click on the button to proceed.

That's when things stop working. It usually it works as expected, but now it just return to the login page, nothing filled. Bellow, an apparently relevant info the shows on browser console:

"ErrorUtils caught an error:

_.getClientCapabilities is not a function [Caught in: Passkey authentication failed during visibility callback]

Subsequent non-fatal errors won't be logged; see https://fburl.com/debugjs. Object { column: "1421", clientTime: 1774704924, extra: {}, guardList: [], hash: "ukkpfs", isNormalizedError: true, line: "86", loggingSource: "FBLOGGER", message: "_.getClientCapabilities is not a function [Caught in: Passkey authentication failed during visibility callback]", messageFormat: "_.getClientCapabilities is not a function [Caught in: Passkey authentication failed during visibility callback]", … } D_9oglqPD5n.js:79:56"

Windows11，firefox版本149.0，增强型跟踪保护设置为标准，基于 HTTPS 的 DNS”启用策略为默认保护，扩展全关。在我打开www.douyin.com的标签页时，通常要加载5秒钟甚至10秒钟，视频才会播放（如图）。作为对比，我在edge浏览器上登陆了同一个抖音账号，打开同样的书签页面，edge并未出现明显加载画面，在chrome上打开未登陆的抖音标签页也未出现明显加载画面。这个情况也许是从近期firefox自动更新后出现的？请问如何解决

I have been using virtualrailfan.com but recently have experienced non operation of the app. Using another browser does not have this difficulty. The site starts OK but going to a sub-site, it refuses to start Virtualrailfan says it is a problem on my end and the fact that another browser works, confirms this fact. They initially said zoom was the problem but changing that in the browser didn't work. Please help

When the browser is open - whether with tabs or not - it disables NVIDIA ShadowPlay. The NVIDIA overlay says “a protected app is preventing desktop capture,” and I’d agree with that if it only happened when tabs with DRM content were open, but it happens even in an empty browser.

I have "Always ask you where to save files" checked but when I save a file I don't get asked where to save the file and it's going into Downloads. I didn't have this issue before. Something isn't working right since the last few updates.

Pat

When attempting to reverse-image search an image, Google Image Search replaces the image with a blank white image.

Steps taken: Verified resistFingerprinting is false. Enabled it, got the usual colored crosshatch image. Disabled, got white box. Tested with PhotoPea (works just fine there). Tested with Chrome (works just fine there). Disabled ETP and generic tracking protections. Tested in private window (nope). Pasting to MSPaint, worked. Saving as an image file and trying to upload that way, nope.

Open to trying more things.

146.0.1 (64-bit) Windows 10 Version 10.0.19045 Build 19045 Addons that may have caused issues: UBlock Origin TamperMonkey Disabled both, same results.

I’ve been troubleshooting a strange networking issue in Firefox that I haven’t been able to pin down, and it seems to be specific to Firefox’s network stack rather than my system or connection.

On several high-traffic sites that sit behind Cloudflare (Discord, Shopify storefronts, some SaaS dashboards), Firefox occasionally stalls during page load. The request shows up in the Network panel as pending for several seconds before finally completing. Sometimes the page partially renders and then hangs until the stalled requests finish.

A few things that make this confusing:

• The same sites load instantly in Chromium-based browsers on the same machine and network • The issue persists even in Firefox Troubleshoot Mode with extensions disabled • DNS over HTTPS on/off does not appear to change behavior • Packet captures show the TCP connection is established quickly, but some HTTP/2 streams appear to wait before data begins flowing • If I force HTTP/1.1 using a proxy for testing, the issue disappears

System details:

OS: Windows 11 Firefox: latest stable release Connection: fiber, low latency, no packet loss locally No system proxy configured

Things I’ve already tried:

• Clearing cache and site data • New Firefox profile • Disabling hardware acceleration • Testing with network.http.http2.enabled toggled • Comparing HAR logs with Chromium

One thing I noticed in the Firefox networking logs is that multiplexed streams sometimes wait behind earlier streams longer than expected, almost like there’s some internal prioritization or queue behavior happening. I’m wondering whether this could be related to HTTP/2 prioritization logic, connection coalescing, or how Firefox handles Cloudflare edge endpoints.

Has anyone seen similar behavior or knows whether there are any advanced networking prefs in about:config worth experimenting with (connection limits, HTTP/2 concurrency, etc.)?

Curious if this might be a known quirk with certain CDNs or just something unique to my environment.

"WebGL error Недостаточно оперативной памяти для запуска клиента. Пожалуйста, скачайте наш Desktop-клиент для возможности играть дальше." Здравствуйте. Испробовал все варианты, которые есть в интернете. Ничего не помогает. На других браузерах этой ошибки нет для этой игры. Оперативной памяти 32 Гб.

Firefox only works properly if my VPN location is in Canada, but I'm in the US. If I switch my VPN to a US location (where I live), Firefox often does not work properly. I get news, ads, etc., that assume I'm Canadian. And often a website will not open. I need my VPN location in the US to access any site I normally do.

I can't access FSIS website which I need to do so for my job. This is what I get

"Firefox can't connect to the server at usda.gov Try connecting with a different device Check your modem or router Disconnect and reconnect to Wi-Fi"

I can't do any of those things because they make absolutely no sense. Nothing is wrong with my router, Wi-Fi. It's your program.

My firefox has been closing while I am away from my computers. I have a few computer running linux (Ubuntu 24.04) and one in mac osx (Big Sur). Usually, I can start firefox and it will remember my tabs which is annoying but still manageable. However, once in a while, (which happened yesterday), all the firefox closed on all the computers and it forgot my tabs when I start firefox again.

I have already set app.update.auto to false on all of the firefox instance prior to this incident to avoid firefox update would close out firefox itself. So if anyone has any idea of what to check to see why firefox keep closing and/or why once in a while it will not remember my tabs, I would really appreciate it.