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Dear Mozilla Support,

My name is Sizhe Xiong. Today when I launched Firefox on my Windows computer, the browser suddenly required me to select or create a new profile before continuing. I had no option to skip this step, so I created a new one.

After that, Firefox asked me to log in or register a Mozilla account. I used the same Gmail address that I’ve always used for Firefox Sync, but it seems that a new account was automatically created, and all my previous data — including bookmarks, history, saved passwords, and extensions — disappeared.

When I checked my local Profiles folder under C:\Users\<username>\AppData\Roaming\Mozilla\Firefox\Profiles, I found several new folders created around the same time, but none of them contain my old data (all places.sqlite files are around 5120 KB).

These bookmarks and passwords are very important to me. Could you please help check if it’s possible to recover my old Firefox data, or if my previous Sync data can still be linked to my Mozilla account (using the same Gmail address)?

Thank you very much for your help.

Best regards, Sizhe Xiong

Issue Summary: My website (mass-doc.com) displays blank thumbnails in Firefox's New Tab "Recent Activity" section, while other websites (Claude.ai, Ahrefs, FamilySearch, Fox News, Xfinity) display their OG images correctly in the same section. Environment: Extensions Installed: uBlock Origin, FireShot (both tested disabled with no change)

Evidence That OG Images Are Correctly Configured:

Google Search Console "Insights" section correctly displays my OG images Social media preview tools show images correctly Images load directly when URL is accessed in browser Image specifications meet requirements: 1200×675 pixels, 132KB file size, JPEG format

Example OG Meta Tags (verified correct):

As my subject states, I am a long-time TBird user - not a wizard or expert, but technically savvy. Now ... with version 140.0.1esr (64-bit), I cannot create a new account as easily as I once did on prior versions.

To be clear, my policy has always been to create new accounts for "A, B, C, and D" for each new year like what you see, left to right, in "Image-1." That has made it the easiest for any research about prior received or sent messages.

Attempting to do that now doesn't work. I put info in every panel; I setup for POP3 and enter a new password; then click Continue and get the message you see, left to right, in "Image-2."  :-(

I could really use some specific, successful advice ... PLEASE!  :-)

I realize this is a lousy day for advice!!  :-(

Hi I cannot find any way to scan an URL QR code directly from Firefox. I expected that a QR code icon would appear when i tap the address bar, but I can't find such icon...

Of course, I checked the settings: camera is enabled in Firefox settings and QR code scanning is enabled in system settings.

Is there any way to scan QR codes directly from Firefox settings?

I use the latest version of both Firefox (146.1 (65627)) and iOS (iOS 26.3 (23D5089e)) iOS is a beta version... Could this be the reason why...

Many thanks in advance for any help on advice.

Hi I cannot find any way to scan an URL QR code directly from Firefox. I expected that a QR code icon would appear when i tap the address bar, but I can't find such icon...

Of course, I checked the settings: camera is enabled in Firefox settings and QR code scanning is enabled in system settings.

Is there any way to scan QR codes directly from Firefox settings?

I use the latest version of both Firefox (146.1 (65627)) and iOS (iOS 26.3 (23D5089e)) iOS is a beta version... Could this be the reason why...

Many thanks in advance for any help on advice.

I was just wondering on m mozilla account it ask for my fire fox url an api's and wonted to know how to find out what fire fox search engines api and url code an address is to set up fox as my search engines on my mozilla account

If I don't use the custom adjustments in my Chrome css, seven buttons on that right side of the menubar are hidden, including the min-max close buttons.

This is problematic when I'm troubleshooting Firefox, and the css is disabled. If I want to close or take the browser out of max mode, I must move those buttons to the navbar, which has no such restriction accommodating those buttons, not to mention why is it necessary for that min-max close trio to monopolize 20% of the menubar. Waste of space. Inefficient.

I'm also curious why must that frame at the top of this sites pages remains persistent, and follows the user down the page, so that when you're composing, and accidentally (and all to often) touch one of those links, it get superimposed over the message, and you must move the cursor to the bottom of the page get rid of it. Not to mention, that frame shrinks the working area of the page about 30% vertically.

I mean, once you have already navigated to the destination page, and you're composing, how often/likely are you going to need to access that area?

I've been using Firefox for a while, and while there are many things I like about it, it has always been a resource hog. In the past I could get around this by just killing Firefox in Windows Resource Manager and restarting, but ever since getting a new computer an upgrading to Windows 11, it's gotten worse. Every couple of days my computer freezes for 10 or more minutes, I'm having to do a hard reboot ever few days, and I'm even bluescreening about twice a month. I'm pretty sure Firefox is the culprit because killing it will usually resolve the issue.

I'm wondering if there is some way to put Firefox in a sandbox so it does not consume nearly all available memory and other computer resources. It is by far the biggest consumer of resources on my system and I do not want to dedicate 4GB+ of memory to an app that is just showing a couple of web pages and playing YouTube videos.

While running Firefox on MacBookAir with macOS 15.7.2 to browse simple websites I keep getting the below warning message. I may have 2 or 3 other apps open (like Apple Mail, MS-Word, Preview). "Heavy memory usage You're running out of memory and your Mac may become noticeably slower. Consider quitting some applications. Firefox 2,48 GB" So I quit Firefox to re-open again and continue my work. Does somebody has an hint where this message can come from ? Any settings to change on my MAC ? Thanks for helping

When I click on a link in emails to open in browser if email has display problems, it opens a blank webpage and a small window that I clicked on OK reappears with Firefox as my default browser. See attached screenshot. If I select Edge to open the email, it works fine.

Please address.

I just bought my boyfriend a new iMac. We are having trouble loading many sites and platforms using the latest Firefox browser. The list is growing but includes Facebook, Meetup, Wikipedia, chess.com, nytimes.com - in all cases, rather than a login screen, we get an error message or a home page loads with no access to other pages or login area. I've cleared the cache, restarted, tried going directly to the site to log in, but nothing works. Everything is fine when using Chrome, but we prefer Firefox. Is this a conflict in the new Apple OS? Is there a fix?

Earlier this year I downloaded Thunderbird and started trying to use it. Early on, I somehow set a password and I am not able to remember that password. So, at that time, I uninstalled Thunderbird and continued using my old Outlook 2016.

Recently, I realized that End of Life for Outlook 2016 was near or already here. So, I decided to try Thunderbird again. HOWEVER, Thunderbird still keeps prompting me for passwords – apparently looking back at my previous installation.

I would REALLY like to get out of my MS connection and continue with Thunderbird, but I am frustrated and can’t get in enough to reset the password/

All assistance and guidance will be very much appreciated.

I am incredibly frustrated by the continuing problem of all my Bookmarks disappearing with the usual "The bookmarks and history system will not be functional because one of Firefox's files is in use by another application. Some security software can cause this problem." This issue has been going on since NOVEMBER!!! I usually manage to get my Bookmarks back by closing all txt files that I need to keep open, store them in a new folder on my laptop, and then restart my laptop. This time, it didn't work.

Can anyone steer me to a permanent solution to this problem?

Thanks, in advance, for any help offered.