Firefox Community Forum

There was an electrical outage and I lost all of my settings,pictures,bookmarks,documents,home page,every thing and I can't get it back....I have tried everything I know (which isn't much) to try and get it back,like a restore,downloading Firefox again thinking that would bring everything back,but nothing I did worked...I really need to get all of that information back up and running again as I have extremely important messages and emails I just can't afford to loose. How can I get my home page back, along with all my other settings? It is so important that I get all of it back !! Can an electrical outage erase everything off of a computer and if so is it lost for good or can I get it back? Please, Help!! Thank you :)

Ever since a recent update, my animated wallpaper for Firefox only plays one frame, and then freezes. If i switch or refresh tabs sometimes it can trigger the GIF to start playing normally, but 90% of the time the background stays frozen, I don't think this issue is related to my PC because the wallpaper was working fine before the Firefox update, and I'm having the exact same issue on my laptop too.

Hi Community,

I’ve used Firefox for over 20 years and it’s always been my main browser, but since updating my Mac to macOS 27, Firefox has become unusable with one of my essential web apps (FlightLogger). The first page after logging in loads normally, but any click or navigation after that fails. The header stays visible, the rest of the page stays blank, and clicking links only adds a “#” to the URL with no content loading.

Safari works perfectly on the same machine and same network.

In Firefox’s console, every JavaScript file coming from CloudFront fails with “CORS request did not succeed (Status code: null)”, and I also see repeated “A ServiceWorker intercepted the request and encountered an unexpected error” messages. Module scripts are also blocked with “Module source URI is not allowed in this document.”

To rule out local issues, I’ve already reinstalled Firefox, created new profiles, cleared all caches/cookies/service workers, disabled all extensions, disabled DNS‑over‑HTTPS, disabled Enhanced Tracking Protection, reset macOS network settings, checked proxy settings, and tried different networks. The problem persists even with a completely fresh Firefox install and profile.

This started immediately after upgrading to macOS 27, and only affects Firefox. Safari loads the same CloudFront assets without any issue. It looks like Firefox can load the initial HTML but cannot fetch any CloudFront‑hosted JavaScript modules, which breaks navigation entirely.

Has anyone else seen this after updating to macOS 27, or found a workaround? I’d really like to keep using Firefox as my main browser.

Thanks in advance

Hello, hope your day is good. Since the internet wide announced date in mid June ;; where Microsoft made bios changes which blocked 3rd party vendors programs from fully connecting ,,, my laptop has not been able to ( run) Firefox ,, with out problems . Even to point where my laptop,, locks up . This summer of 2026 has been the worst computer stability issues ever. I’ve been forced to constantly hard stop my rig , spend hours with rebooting ,, and then using Revo to delete non MS apps ,, then download apps ,, especially FireFox Is there a permanent fix to get around the deranged tyrants at MS . Thank you

Firefox 156.0, Windows 11.

On dzen.ru/news mouse wheel scrolling jumps back up. On ozon.ru left-click on account menu items does nothing (middle-click and right-click → open in new tab work fine). Worked normally ~1 month ago. Clean profile doesn't help. Hardware acceleration is enabled (WebRender Layer Compositor).

Download FF install sign-in > said success then show warning

``` Are you sure you want to sign in to sync?

A different user was previously signed in to sync on this computer. Signing in will merge this browser’s bookmarks, passwords and other settings with xxxx@gmail.com ````

Press continue, the pop-up still appear and the sign-in was false positive.

FF version : 156.0 (64-bit)

Hi, I'm trying to pair my devices but it gets to the authenticator step but doesn't say which authenticator it needs. Is there another step I should be taking? Lou

I set value to true to disable IPv6 and it worked for some websites, but not all. Works fine in Opera browser. Further corrections are more technical than I can handle. What should I do? I turned on logging, but don't know how to upload it.

Kept getting messages that Firefox is unresponsive during use. Has now stopped all together. Uninstalled and reloaded, got a welcome to Firefox message then it went unresponsive again. Now a double click on the App to start does nothing.

I want to clear the cache on this laptop that has been in storage for months, but I can't get the instructions question lines to respond when I check the boxes ??? What am i missing?

I am using Firefox 155.01 on MacBook Air (M1).

I updated to OS 27.0 yesterday.

I have tracking protection set to Standard (same as before the software update).

Websites I need to use frequently, such as my health care provider, just twirl, will not open.

I've seen this on a few sites and it sounds like this person also experienced this. It happens on Linux and Window. I don't think it's a new bug/behavior.

I'll use vanguard.com as an example.

1. Visit investor.vanguard.com site. Click that you'd like to log on. 2. I'll be placed on a login.vanguard.com page that displays a Username field and a Password field. Because I've logged in before, those fields are yellow and filled in with the proper values. (In the case of the password field, it's all stars, but when I click to reveal the password, it's the correct password.) 3. Click on the "Log In". 4. The browser rerenders the page claiming that the userid or password is wrong.

But if I follow the above steps, but add a step:

2.5. I slightly edit both (one is not sufficient) fields, removing a character and putting it back in so the values are edited but not changed. As I do this the fields become white instead of yellow.

Now when I reach step (4), I'm actually logged in without complaints.

The underlying AJAX request is pretty cryptic, so I can't quickly spot/debug what happens at that level, but I assume the page is not passing the field values visible as yellow. on the page.

Am I misunderstanding how the yellow auto-fill works? (On most sites it works as I expected and no reediting the autofilled fields is necessary.)

Can this be fixed or should I put up with it?

I created a Gmail account so I could use it to sync my mozilla browser but I tried to you it too quickly and it was temporarily blocked by google.

I submitted an appeal and they unblocked it, but since then I have been unable to receive any verification codes that are sent to that email address.

I assume it's on some kind of list that is suppressing being able to send to it.

I’m experiencing a strange issue on Firefox where a separate blank/dark window briefly appears over the browser while I’m browsing, then disappears.

The window appears to have the Firefox icon in the top-left and what looks like a Firefox tab/address-bar interface, but there is no visible text or error message.

It happens randomly while Firefox is open, including while watching YouTube. It does not appear when Firefox is closed.

Troubleshooting already performed:

• Windows 11 cloud reinstall using Remove everything
• New Microsoft account
• Defender Offline scan clean
• Multiple malware scanners clean
• Malwarebytes Premium installed
• uBlock Origin (only extension i use) removed/tested, but the issue remained

I took a picture showing the window appearing. Is this a known Firefox issue, background Firefox process, or something else?

Issue occurred on September 6:When I was running a game and updated my graphics card driver, Firefox was running in the background. My PC went completely black and became unresponsive, so I had to force‑restart the computer.

After rebooting, Firefox reverted to a brand‑new fresh‑install state. All my browser settings, login status, local profiles, browsing sessions, hundreds of open tabs and my categorized tab groups disappeared, only the welcome startup guide showed up.

I logged into my Mozilla account on my Android Firefox device. Some browsing history was synced back. However, synced history cannot restore the original tab session back‑forward page history, nor my manually sorted tab groups. All browser preferences, theme and language settings are also lost.

I originally had 4 separate local Firefox profiles on this Windows computer, isolated from each other for different work purposes. Only one profile was logged‑in to my Mozilla account and could partially sync data. The other three local profiles are completely gone. Those extra local profiles were NOT signed into any Mozilla account and were never synced to cloud storage.

In my Mozilla account’s connected devices list, there are two entries both belonging to this same computer: “MARSHAKK” and “Firefox by Administrator on MARSHAKK”, which correspond to my Firefox instance before and after the crash.

I cannot understand the community help articles about session recovery, and I’m unable to locate or restore my old local Firefox profiles and lost tab sessions by myself. Please give me assistance.