Firefox Community Forum

When trying to log into my bank, I get the following message: "Bad Request: Your browser sent a request that this server could not understand". I have tried to clear cookies, to no avail.

1. 1. Резюме выделенного

1. 1. 1. Общее

Выделенный фрагмент содержит **цепочку из трёх X.509 TLS-сертификатов** (формат PEM), а также временну́ю метку **«5–7 минут»** (вероятно, срок действия или контекст страницы).

---

1. 1. 1. Сертификат 1 — Конечный (End-Entity)

- **Субъект:** `accounts.firefox.com` - **Выдан:** Let's Encrypt (R13) - **Действителен:** 15.02.2026 — 16.05.2026 - **Тип:** TLS-сертификат сервера (Domain Validated) - **Алгоритм:** RSA 2048 / SHA-256

---

1. 1. 1. Сертификат 2 — Промежуточный (Intermediate CA)

- **Субъект:** `R13` (Let's Encrypt) - **Выдан:** ISRG Root X1 - **Действителен:** 13.03.2024 — 12.03.2027 - **Назначение:** Подпись конечных сертификатов Let's Encrypt

---

1. 1. 1. Сертификат 3 — Корневой (Root CA)

- **Субъект:** `ISRG Root X1` (Internet Security Research Group) - **Действителен:** 04.06.2015 — 04.06.2035 - **Назначение:** Доверенный корневой центр сертификации; самоподписанный

---

1. 1. 1. Итог

Полная цепочка доверия: `accounts.firefox.com` → `Let's Encrypt R13` → `ISRG Root X1`

The interface is terrible, it makes me completely unwilling to use the browser. Why make the tabs merge without any separation????!! It's disgusting!!

How can I change the tabs' appearance so they appear as individual tiles instead of a continuous view?

The screenshot shows the tabs of a HEALTHY person

In Firefox (up to date yes) when I embed a YT video to the forums I use, it comes up with an YouTube Configuration Error 153.

How do I fis this? YT embedded on Chrome & Brave etc play perfectly, but Mozilla always sends me to YouTube itself.

these shortcuts appear on my firefox home page are so annoying here is my setting , i toggle off all shortcuts related to history or sponsored shortcuts but they still pop up each time , i want to disable this feature i need only my selected shortcuts appear on home page what can i do ?

Using Drawings in Microsoft Word (web app) breaks after inserting more than 2-3 text boxes and shapes. The error typically displays as "This page is slowing down Firefox..." Steps to Reproduce: -install Firefox on a Windows 11 machine -sign into Microsoft 365 web -create a new word document -click "insert" in the top list -Click "Drawing" in the menu that appears -Insert multiple shapes and text boxes with text

I use siscom.net for my emails. The pointer doesn't seem to open the emails. It changes into a finger on a hand and doesn't trigger the opening of the emails. I'm using Windows 11.

On February 22, my bank, (5/3.com), decided a transaction I was making using my debit card was suspicious and locked my account. I contacted them and informed them this was a legitimate transaction and they unlocked my account, and everything seemed to be alright, my card was working all seemed well. That is until I tried to log in and check my balance and I could not get in. I then contacted the bank customer service and spent over an hour with them attempting to resolve this issue to no avail. The person on the line suggested that I try another browser so I connected to Edge, entered my log in and password, (which is stored in my Mozilla), and it went right through which proved two things, my password and login were correct and the issue is with Firefox which is very odd to me since it has always worked perfectly as long as I have been with this bank. Again, this issue began when the bank lock my account and as a side note they did the same thing with my wife's account, she called and they unlocked her account and every thing works as before and she can still use her Firefox and gets right in to the same bank with no issues but not me. Again, this started on the date I provided above and I can use any other browser and I get right in with no problem but I am a loyal Firefox user and I want to only use Firefox so I hope you can assist me in resolving this aggravating issue!

Thank you and Kind regards, George Morris

Over the last couple of months, Firefox has automatically added Favorites to my home screen. If I delete one of these another replaces it.

Where do I go to stop this?

Why can't Firefox open .mht email extensions within its default browser? It has never done so to my knowledge. They always point to Internet Explorer or Microsoft Edge.

Often an email may not display images correctly and the ability to open them in a web browser is offered, "If there are problems with how this message is displayed, click here to view it in a web browser." This is certainly a development addition when people view their Gmail from Firefox or use Outlook. Not everybody uses APPS. People who don't want Microsoft Edge watching every move they make have made effective permanent changes in removing the deep embedded PUP by Microsoft.

Firefox version: 148.0

I've always used firefox

Recently it seems to me that a lot of sites don't seem to recognise me, so I have to do multi step logins.

Paypal for instance. I don't save the password, I type it in each time, but now it insists on sending me an SMS in addition

My guess is that FF is deleting some cookies that I'd rather it didn't. What can I do?

Thanks

Hi, my PC had some hardware problem and al its data was wiped as procedure, so i had to install everything from zero, this includes Firefox, and when i did so i did the same as usual, download it, open it and log in to sync my data, but there seems to be a problem, all my data is gone, it says its synced and i try to sync it many times, no bookmarks, no extensions, no passwords, nothing, this is my only account too. tried to look up solutions online and saw people talk about 'old Firefox data' folder that can appear on the desktop but nothing for me, tried to go to about:profiles and see what profiles i had and switch to see if its in any or if the folder appears but still nothing, i don't seem to find a solution, i only got the PC back at the end of December last year, and its as far as i can see my Firefox activity here, but I've always used this account and I've synced in multiple PC's with no problem i don't understand what is happening now. thank you

I have a profile that I had copied from my main profile, which is connected to an email and synced. This second profile is unsynced, and it won't let me sign into my account because that account is connected to the main profile. It says I need a separate account for a separate profile. Fair enough. I try to make an account. It says I cannot sign in to the new account because the profile is synced to the old one. Very annoying to be given instructions that don't work. So, I make a new profile and sign in to my new account on it. It works. But now I don't have my bookmarks and passwords. So I find instructions on backing up my account and copy my secondary profile into the new profile with the new account. It logs me out and is now giving me the same error! (the backup was successful though) I don't want to have to copy and paste all of my passwords and things into a new account. Is there any way to make my secondary profile syncable?

I have no issue with youtube on any other browser, but I do prefer Firefox. However, Fierfox says that site is slowing down firefox and suggests I close that page. Firefox did not do this in the past. Is this similar to the rather ugly color of the private window that I can't change, not being a coder? The impression I get is that Mozilla is making changes without assuring they work properly. I currently have to use chrome to make sure youtube works correctly.

The most recent update has caused an issue with LinkedIn. The problem only occurs with Firefox, not with Chrome or Edge. Do you know what it is? How to fix it? The profile photos are being overwritten with the name of the person and title.

As mentioned, When google email account is open, opening another operative window, firefox automatically closes the email account. Why is this ? This looks to me as a possible bug or IE security program intervening to avoid cross connectivity and security violations between other opened windows. Correct ? This is annoying as an R&D engineer it is common to work with several opened windows. Any solutions or fixes ? rJ