Firefox Community Forum

In my org - ever since the release of Firefox 146 - each time an update is rolled out on a WIndows 11 endpoint - Firefox is no longer able to launch.

This is resolved by uninstalling and reinstalling the client. We've had no issues with the ESR release in my testing.

What changed? Anyone else experiencing this?

I had our security team take a look at the antivirus - they've confirmed we aren't blocking Firefox and they did not see any block reports.

No relevant policy changes have gone through around the time of the incident. Initially I suspected users were installing Firefox ESR from the Company Portal alongside the standard release - but confirmed this is not the case. Also ruled out browser extensions - error persisted across a config without any extensions.

Please let me know if there is troubleshooting info I can collect. I included info from my own browser, but I reinstalled on the 27th and it has been working since. However, it has broke specifically on the days new releases have come out.

Thank you for any suggestions!

They play for a couple of seconds, then the panel they are playing in goes black. They used to work a month or two ago. Videos play fine in YouTube. They also play fine in apps like VideoPlayer and VLC. They play fine in Chromium based browsers Opera, Brave and Vivaldi. My graphics card requires switching acceleration off. I can’t find a switch for that in Firefox.

Problem Videos start playing, then after a few seconds the video panel turns black. Audio may continue. Refreshing does not help.

Environment

   OS: Fedora Linux 43
   Firefox 147.0.1 (also tested Firefox Flatpak)
   Display server: Wayland and X11 (both tested)
   Hardware acceleration: on and off (tested)
   Media Source Extensions: enabled (disabling MSE triggers an “unsupported device” error)

What works

   BBC News videos play correctly in Chromium-based browsers (Brave, Vivaldi)
   Videos play correctly in mpv/VLC
   Other video sites (e.g., YouTube) play correctly in Firefox

What I’ve tried in Firefox

   Disabling hardware acceleration
   Disabling VA-API
   Disabling WebRender
   Disabling RDD sandbox
   Running Firefox under X11
   Using the Firefox Flatpak build

None of these measures help. This suggests the issue is related to Firefox’s interaction with BBC’s player on Linux. Has anyone else seen this, or is there a known workaround?

How do you avoid/deal with Firefox website incompatibilities? This happened on consecutive visits to two different websites today before I posted here.

In the first one, I disabled Ublock, cleared cache and cookies, and the site loaded, I then enabled Ublock with no error prompted.

Then I got a tab crash on Youtube. I wouldn't call tab crashes a daily occurrence for me, but I'm accustomed to them

Is there any way to get the root of this. The only recent changes I can think of are browser and addon updates. Should I post my list of addons?

I cannot find Firefox About - Help because I don’t see the toolbar that is supposed to contain the About button.

I am using Firefox 147.2.1 (67326) on an iPhone 13 Pro 26.2.1

Any help is much appreciated!

This setting, "Always ask you where to save files," is definitely broken.

In a related article, they provided this solution: https://support.mozilla.org/en-US/que.../1534384 https://support.mozilla.org/en-US/questions/1534384]

Proposed solution: "I believe you also need to go into Tools -> Settings -> General and set the Action for the types of downloads (Applications) to Always Ask for those types you want it to."

But this workaround should not be needed. "Always ask" means always ask. As in always. No other additional steps should be needed.

Can you folks please open a bug to get this fixed? This used to work just fine in (much) older versions of Firefox and Netscape. "Always ask" is supposed to mean always ask. Like, always.

I have disabled and removed any and all VPN's from my main unit. I have reloaded Firefox and cleaned the registry. Still getting the message and am unable to display images. Any ideas?

Roblox was blocked on my device and I wanted to get it unblocked and play it on Infrexa with Firefox. I already followed steps mentioned on the official webpage: https://www.infrexa.com/now-gg-roblox-login-and-play-roblox-unblocked-on-your-browser so please don't advise similar troubleshooting methods.

Now I am able to play roblox but the problem is that when I play the Roblox through "Mozilla Firefox" it shows an error "Firefox is already running but is not responding" and then becomes unresponsive when pressing refresh button, the fan gets faster and device heats up with too much hanging. But when I open the Roblox through "Chrome" it comparatively works good and asks for login details and after redirection it allows me to play Roblox Unblocked without any issue. "Roblox unblocked" here simply means a technical sense, meaning “not crashing” or “free from software or network errors and or browser malfunction".

I have been using Firefox for a long time and my passwords and user ids are saved in the browser so I want to continue using "Firefox" as default browser but I am having the issue in playing roblox unblocked and other games through Firefox browser. I think the current issue that I have started facing is especially after a recent windows update.

I also tried many other gaming platforms like Official Roblox.com, Now.gg Roblox, easyfun.gg and web.cloudmoonapp.com but all of them faced same issues on Firefox while running ok on Chrome.

I am currently running Windows 11 (25H2 Licensed version). I want to play roblox unblocked on my device using Firefox (updated). My parents have already allowed me to play Roblox and I am playing it on my own device and internet connection. Please fix the browser issue and unblock Roblox for me. Please also check my browser version against Windows 11 compatibility if possible.

If you fix this issue for me, I will be grateful to you.

You started pushing a widget a while back that shows the days I've been on Yahoo, concurrent and otherwise. This thing is annoying and I want it gone. I don't care how much I've used Yahoo on my devices and You already know via tracking cookies.

Make it go away or tell me how to get rid of it - PLEASE.

I won't show my account information but when I try to access Amtrak's Guest Rewards site it goes into a loop. First it asks for username & password and accepts that with no problem. Then it asks for the code it sends to my cell phone and accepts that. And then it just keeps reloading various pages until I kill it. This is the error message shown in the log, it's repeated over and over:

NS_ERROR_ILLEGAL_VALUE: Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIFaviconService.replaceFaviconDataFromDataURL]

   loadFavicon resource:///modules/PlacesUIUtils.sys.mjs:220
   loadFavicon resource:///modules/PlacesUIUtils.sys.mjs:647
   setIconFromLink resource:///actors/LinkHandlerParent.sys.mjs:139
   receiveMessage resource:///actors/LinkHandlerParent.sys.mjs:60

LinkHandlerParent.sys.mjs:148:17

I'm running under Mac OS 10.13.6 The site loads fine when I use Safari (version 13.1.2)

Thanks

Windows 10 pro OS is persistently repeatedly blocking every attempt I make at Installing Firefox.

Basis: the exe. / installer, is potentially harmful to the PC.

My investigation: Is 4GB RAM sufficient to reasonably run my Lenovo ThinkPad Edge 420s(4401-7SG) PC? OS Windows Pro.

Firstly, because, It is annoying to manually have set browser.tabs.groups.smart.enabled and browser.tabs.groups.enabled to false every time when installing firefox.

Secondly, because this is not sufficient to restore the normal correct beaviour. Tabs cannot be detached despite browser.tabs.allowTabDetach being true.

FF 141.0 on FreeBSD, only extension is NoScript.

What needs to be done still so that tabs can be detached?

P.S.: Suggested long term solution: Introduce an option "Disable tab groups ENTIRELY, restore behaviour as it was before introduction of tab groups.".

I have two credit cards saved in Firefox 147.0.2. When a web site asks for my cc info, a yellow box opens identifying both cards. When I hover over one, the boxes are filled in in yellow. When I click on the card i wish to use, everything disappears and all of the boxes are blank and back to their original color.

I am on a MAC running Tahoe OS 26.2

What am I doing wrong?

I picked "performance and connectivity" because I am NOT connecting with you due to your constant Leftist biased performance.

I just thought you might like to know that because you keep posting biased fake Leftist news from CNN, AP, PBS, NPR, Axios, The Guardian, Washington Post, NY Times, etc., on my Firefox home page, I have BLOCKED all your content. I kept dismissing the CNN, etc. content but you kept right on sending it back.

- Richard W. Perkins

My profile images have weird graphical issues behind the profile images. I don't find anyone else mentioning this but I am sure I am not the only one. What can I do to fix this, it is very annoying.

Hi,

Since last week I am unable to properly use some websites that are failing due to CORS requests, but they were working before. Some examples are es.webuy.com or a local Jellyfin instance. After trying to enable/disable some settings that I thought could be related to the problem, like security levels, I ended up creating a new profile. In this new profile everything works, but as soon as I synchronize my Mozilla account, then these websites start failing again with CORS requests errors.

Any idea about what setting might it be the one causing problems? Or any idea about how can I debug/troubleshoot it myself?

Thanks!