Firefox Community Forum

Firefox fait ses recherches en allemand sur mon ordinateur, alors que j'ai déjà plusieurs fois indiqué dans les paramètres que je voulais des recherches en français. Et rien ne change. Comment dois-je procéder pour changer ça?

1. 1. Steps to reproduce

Open several tabs, in settings, check «ouvrir les fenêtres et onglets précédents», quit firefox.

1. 1. 1. Expected behavior

On startup, Firefox should reopen with the same tabs before shutdown.

1. 1. 1. Actual behavior

Firefox opens with one empty tab. Forcing me to got to «history -> recently closed windows -> restore» everytime I quit Firefox or shutdown the mac.

1. 1. 1. Device & build information

• Device: MacOs Tahoe 26
• Build version: firefox 148.0.2
• First seen version: MacOs Sequoia

1. 1. 1. Notes

Fresh migration from Win 11 to Mac. tabs, passwords, bookmarks, plugins migrated from win to mac. Attachments:

When I switched to vertical tabs in Firefox, the Hikcentral professional web client camera server page changed, part of the page appeared at the top, making it difficult to use and watch the camera images, and the image doesn't display properly. How can I fix this problem?

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.

This just happened, (45 minutes). When I attempt to access a page or a file, when the page comes up on screen, it is a page of numbers and symbols. How do I remove these pages??

I can't open Firefox at all, so I downloaded Firefox again, before I got your message. The Crash ID: ⁨bp-958359b9-d3d4-4cba-aa19-4dcbc0260313⁩

That is the only one, not five crash ID's. I couldn't open Firefox to find an omni.ja file.

I can't import or access my bookmarks or passwords on the new Firefox I installed. Would you please be able to help with that?

Hi everyone,

I do a lot of downloading images in bulk for my neocities website and its really helpful for me to be bale to drag an image from say, tumblr, to my neocities tab and just drop it into the download box. I love Firefox but I couldn't find a way to use this feature, so I downloaded the QuickDrag WE extension, which allows me to drag and drop images from duckduckgo images, but not tumblr.

(for info I'm using Windows 11)

Would love to have some help on this! Thank you Kit

Lost my Passwords on my desktop and can't recover them through profile manager, I found them on my android phone and want to recover my passwords from there, but am worried if I try and sync to the desktop, the desktop might overwrite the passwords in the phone.

Ok, This is a bit of a question that seems to have many answers but none that have ever worked for me. I have in the past 12 months probably formatted my PC 4 times, and I have at least 12 profiles on Firefox nightly, not to mention the rest of the family. It's not really a problem to redo them every time, but it is just a painstaking simple process. If I could just backup the profile folder, copy it move it change it whatever, it would be nice and simple, even to transfer from one pc to another in the house, but every time I try, It fails. Copy the Userdata folder, copy the entire firefox folder, blah blah blah, never can I do it. I believe it has something to do with security that you can't just copy and the entire profile folder, but some way to backup the profiles exists surely? One that actually works. Cheers All!

I can no longer access YouTube videos (video unavailable) with Windows 10 and Firefox. However, I can access them with Google Chrome. How can I resolve this issue?

bonjour, je souhaiterais éliminer les liens magnets pour un téléchargement automatique sur des sites P2P comme torrent 911 ou autre ? pouvez-vous me guider sur cette manipulation ?

bien cordialement

Several extensions were recently deleted without my input. Among them were Duck Duck Go Privacy Essentials, Keeper Password Manager, and Apple's iCloud Password autofill. I know there were others, but I cannot even recall which ones they were. Not sure if this happened after the most recent update or later, but it happened at some point in the last 24 hours given that today is 3-15-2026 12:30 pm PST. I only discovered this when a tab popped up in Firefox asking me to complete a survey as to why I uninstalled Duck Duck Go Privacy Essentials, which in fact I NEVER did. See attached pic. Nor did I uninstall any of the aforementioned, et. al. Thanks Mozilla for f'ing up my settings and overall browsing experience across all of my devices without my consent.

When I try to go into my google account for any reason and a few other websites, it will say use passkey or try another way. I have done both several times and Firefox ALWAYS FREEZES and I have to force quit. I have reinstalled Firefox, gotten rid of all cookies and cache, gotten rid of extensions and everything I could do from the help website but nothing seems to work. I have also reinstalled Firefox but the same thing keeps happening. I need HELP!

Description: I need help with the "Firefox Multi-Account Containers" extension.

The extension is installed and shows as "enabled" in my Add-ons Manager. However, the colorful container icon does NOT appear on my toolbar, so I cannot access or use the extension at all.

What I have already tried (none worked):

· Dragging the extension icon from the puzzle menu to the toolbar · Right-clicking on the extension icon (inside the puzzle menu) to see if there is a "Pin to Toolbar" option — but the option does NOT appear at all · Restarting Firefox multiple times · Restarting my computer · Creating a new profile in about:profiles and testing the extension there — still no icon · Disabling and re-enabling the extension

The extension is installed and enabled, but without the toolbar icon, I cannot create containers or separate my Gmail accounts. I really need this feature.

I have read that this might be a bug in recent Firefox versions. Is there a known fix? Do I need to completely uninstall Firefox and reinstall it? If so, could you please guide me on how to do a clean uninstall (removing all profile folders and registry entries) and then install the latest version?

My system is Windows (older version, if that matters).

Thank you very much for any help!

Hi, I opened Firefox to continue with my work, just to get greeted with a 'start a new profile' page. All my profiles, saved data, history, add-ons and customization, were discconected/removed. Even on my phone it logged me out from my account- logging back in doesnt retrieve my history from my previous sessions on my desktop device.

I tried logging in to my account, checking if theres an 'old firefox' folder on my device or anything like that, but it did not retrieve any of my old data.

Just to clarify, I have not played around with my settings, left or deleted anything, so I really dont understand why I've just came back to nothing.

Was wondering why this happened, how do I know this won't happen in the future, and if, when possible, how can i get all my data back?

Thanks