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Apologies if this is the wrong place to ask this because I'm at my wits end on this one. I work on an app that is used by a large amount of users. Starting october 14th around 7am (UTC+1) we started observing weird behavior where a small ammount of traffic (less that 1%) would have abnormal header values:

'custom-header-1':'[custom value], [custom value of a different header]'; 'custom-header-2':'[custome value of header 2], u=4'; 'sec-fetch-site':'cors'; 'priority':'same-origin'; 'sec-fetch-mode':'empty';

As you can see the values of these headers are mixed with one another in almost a deliberate manner (since it appended the u=4 with a comma separator and a space from the priority into the custom header 2 value). There is nothing in the client code that would do this kind of manipulation, and from examining the logs this only happens on Mozilla browser traffic starting version 144 (which was released on October 14th coincidentally). Not that this does not impact all Firefox traffic. In fact, just a tiny fraction of traffic from random users and it's not even all of their traffic of an active session. Just random requests that then fail, are retried and the abnormal headers are gone.

I doubt the fault lies in firefox. If I had to hazard a guess it's probably some extension acting up, but the timing coinciding with the release of 144 give me the only troubleshooting path I have right now since contacting the users is not possible. We've seen it happen 145 as well.

I'm not really looking for a solution here, just a shot in the dark if someone else has experienced this or has some insight as of what this could be.

Hi

I am using the latest TB build, 144.0.1and have only the British dictionary as an extension, no themes.

Occasionally TB will hang when launched and the Windows event viewer will show this....(added image)_

The friendly xml log within the event viewer...

AppName thunderbird.exe

 AppVersion 144.0.1.0 
 ProcessId 0x6234 
 StartTime 0x1dc51956edcf231 
 TerminationTime 5 
 ExeFileName C:\Program Files\Mozilla Thunderbird\thunderbird.exe 
 ReportId f3ad169f-c629-4357-85ae-7db29d0541f1 
 PackageFullName  
 PackageRelativeAppId  

HangType Cross-process

as noted, this only happens when the email client is launched and will not happen each time. I have tried without the dictionary, as it is so random it can take a while to occur, but that does not seem to make a difference.

I am using Windows 11 25h2

Thanks

Lors de la création d'un nouveau compte avec une adrese gmail ce message s'affiche :"Le serveur ne peut pas traiter la requête, car son format est incorrect. Nous vous recommandons de ne pas réessayer. C'est tout ce que nous savons."

On the screenshots you can see my wallpaper and desktop icons peeking through. This problem had started like a month ago and it was just a one time thing, after opening the browser and getting fullscreen the 2nd it never came back until restarting the browser. Now after the updated with rounded edges everywhere, going fullscreen is always misaligned

I installed MThunderbird on my Android phone today, using a QR Code to import settings. Receiving messages works perfectly, while sending messages is a mission impossible. I keep getting the message when sending: "Authentificanion failed". I have the same settings on my computer, and Thunderbird works normally, both sending and receiving messages. I don't know where the problem could be, so please help!

I'm also attaching a screenshot of the outgoing server from the desktop computer, which is also set up on the mobile application.

This is where you describe the issue in detail.

Explain what’s happening (e.g., “Videos keep freezing after 10 seconds”).

Mention when it started and what you already tried.

Include your Firefox version (you can find it under Menu → Help → About Firefox).

I already had two separate "old style" profiles, for personal and work browsing. I just created a new profile (from my "old" personal profile) using the new Profile Manager. I managed to import data from my "old" work profile to the new one. In this process, I ended up creating two new work profiles (with different names). Now, I simply cannot delete one of them. Clicking on the delete icon on the profile manager opens the new profile, and I understood I should see a confirmation dialog corresponding to the "about:deleteprofile" URL, but nothing is shown on this case. Also, this new browser instance doesn't show any profile management menu items.

I tried manually removing the profile directory on ~/.mozilla/firefox hoping Firefox would understand it is gone and would automatically get rid of it, but instead it automatically creates a new empty profile on the same directory, and also unmanageable and undeletable.

So, if someone could please tell me how I can get rid of this new bogus profile, I'd be very thankful.

BTW this whole "new" profiles is a cool idea, but IMHO it was launched in a premature state. They are prettier, indeed, but besides the above annoying bug, there are no CLI args to switch directly to a "new" profile or open the new profile manager. This makes it impossible to use apps like Junction which allows you to choose a browser when you try to open a link (which worked just fine with the "old" profiles)

Hi! So I just installed firefox and I got onto annoying issue. I like using shortcuts on my homepage, but I started to get some shortcuts added automatically and they bother me a lot. I tried removing them or deleting from history, but as soon as I click the button, one shortcuts gets removed and immediately gets swityched with another one automatically. So I'm stuck in the infinite loop of removing shortcuts and my manually added ones just get lost in all this mess.

When I opened Thunderbird this morning it shows only local folders. I urgently need to retrieve the others as at the moment I am unable to send emails. I can access address book but it will not let me send. I am 86 so nothing to technical please.

As this happened just after the update today I think there must be a.problem with the update so therefore you need to supply a fix ASAP As I have said I am unable to access any menus so no access to account setting, cookies, new bookmarks, this only appears to be affecting Firefox on PC's, as I opened this tab on my phone

Hi.

After the Windows has just updated, the "Bookmarks" ribbon on top of the screen is unavailable. What can I do to get it back. The directions have just confused me further.

Regards,

Frank

Dear friends, This is another question of the type "it has stopped to work after years of perfect service". I do: Tools/Message filters/. The filters are for me (only user). The "Enabled filters" drop-down list shows 238 items with virtually everyone enabled. Then I select folder to be filtered in the input window at the bottom; my "Sent" folder. Then, when I click the button "Run Now", nothing, absolutely nothing, happens. Normally Thunderbird lists messages like "Moved x mails from Sent to folder Y" .

Thunderbird 144.0.1 (64-bit) under Windows 10 which was first removed whereupon it was downloaded and reinstalled.

Hopefully someone has a suggestion where I can check for the cause of this error? Ch

At about 9 AM EST, 11/12, Firefox did an update that rendered accessibility through my voice navigation software inoperable. I need to use this to navigate the web due to disabilities with my hands. The system could no longer recognize any thing buttons or words on webpages, including the Firefox tabs at the top left of screen. I posted a question about this on 11/13. Later that afternoon, the functionality was restored. However, this morning, 11/13, this functionality has vanished again. Can this please be restored? Something obviously went awry in the coding with this most recent update. Thank you.

On one of my Hotmail email accounts it doesn't download new email messages. I get a message saying "User is authorized but not connected". On my other hotmail and gmail email accounts they download OK.