Diễn đàn hỗ trợ Firefox

Moin, seit einigen Tagen startet Firefox bei Klick auf das Symbol in der Taskleiste nicht. Wenn ich mehrmals klicke erscheint Firefox soviele Male wie geklickt. Mein System: Win11 25H2. Kann jemand helfen?

The full error message is: "The procedure entry point ?WindowsBCryptinitialization@mozilla@@YA_NXZ could not be located in the dynamic link library C:\Program Files\Mozilla Firefox\xul.dll."

After accepting that, I get another message that says: "Couldn't load XPCOM." Then, it just quits, with no Crash Reporter dialog.

I downloaded a fresh installer, but it takes a couple minutes to even launch, and then just sits there for a long time on the initial screen doing nothing before saying the installation failed. I've restarted my computer twice hoping it was a one-off issue, but there's no change.

According to the file information, xul.dll was last changed September 3rd, so it may not be the source of the issue. Perhaps whatever name mangling is responsible for the above entry point changed and now they don't match?

I have automatic updates set to "download but don't install", so it downloaded it a few days ago and I just restarted it this evening and the issue occurred. I could understand that maybe something got corrupted during the update, but I have no idea how the installer could also be failing.

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.

macOS Tahoe 26.6（Intel Mac）でFirefoxが使用不能になっています。

【症状】 設定画面や一部のaboutページ（about:networkingなど）は開く 新しいタブを開くと非常に遅い、または開かない アドレスバーで検索してもグルグルのままで結果が出ない about:support は表示されない about:config も開けなくなった アドレスバーにURLを入力してEnterすると消えてしまう

【試したこと】 トラブルシューティングモード → 改善せず 新規プロファイル作成・別プロセス起動 → 同じ症状 完全アンインストール（AppCleaner使用）＋再インストール → 改善せず ベータ版（158.0b1）・安定版（156.0.1）・Nightly すべてで同じ症状 about:config で以下を変更 → 改善せず network.http.http3.enable = false network.dns.native_https_query = false network.dns.disableIPv6 = true

DNS over HTTPS オフ プロキシ設定を「なし」に変更 ハードウェアアクセラレーション関連の変更 ユーザーライブラリ内のFirefox関連フォルダをすべて削除して再インストール

【ターミナルでのエラー（重要）】 textFailed to launch tab subprocess @MachCheckInListener TimedOut Failed to launch gpu subprocess @MachCheckInListener TimedOut Failed to launch socket subprocess @MachCheckInListener TimedOut Failed to launch utility subprocess 完全再インストール後も同じエラーが再現します。

【環境】 macOS: Tahoe 26.6 CPU: Intel Safari: 正常に動作

プロファイルや拡張機能の問題ではなく、子プロセス（content process）の起動自体が失敗している状態です。 ご確認よろしくお願いいたします。

t takes 4 or more time to open Firefox browser. Each time I get a message that said Firefox is not responding and this locks up the programs. I reboot the systems each time and this does not help to open Firefox browser. What is causing this malfunction and how to fix it?

Hello,

I have the following error message......."The Application has failed to start because its side-by-side configuration is incorrect. Please see the application event log or use the command-line sestrace.exe tool for more detail?

This error message pops up when I click on the Firefox icon. How do I correct this error message?

Thank you.

My firefox has been acting weird all of a sudden. Usually when I open firefox it loads all my tabs of the previous session and prompts me to enter my master password. But now when I start firefox, it opens for a brief moment and then instantly closes again. When I open firefox again all I get is a new empty window without any tabs, the password prompt also doesn't appear. So I have to manually open my last closed window to get the old window with all the tabs back (so I guess the window that closes instantly was the proper one) but the master password prompt won't show up. I can't access all my saved passwords in the password manager since I'm expected to sign in but when I click on "sign in" nothing happens - I guess the master password dialog just doesn't show up blocking me out of it. The only solution I have found so far is to go to about:support and clear start-up cache data. When it reopens afterwards I get the working window back, with my saved tabs and the master password dialog shows up - everything works. But it only works for this session, when I reboot the computer I have to do the whole issue again. Opening it in safe-mode also works but I need my addons and since it starts after clearing startup cache I don't think the addons are to blame. It just happened all of a sudden, I didn't install any updates or new version prior to the error.

Can anyone please help me? :(

Hello and I hope you are doing good,

Sadly for me it is absolutely not the case It has been a few days since I can't use Firefox at all. When I try to open it, it tells that there is a "side by side error" and that I should use sxstrace.exe. I did that and it tells me that It can't find mozglue, mozglue.MANIFEST, mozglue.DLL. I use Mozilla in French (it is my mother tongue), and it can't find them in French, English or in Neutral :

Thinking it was also linked to the Redistribuables Microsoft Visual C++, I just downloaded all of them again.

My version of Mozilla is 152.0.6.595 and I am on Windows 10.

Please I really need your help and don't want to lose any of my tabs, bookmarks and passwords as I was making very important research for my PHD studies.

Real thanks in advance for your help.

Buenas. Me es imposible arrancar Firefox 155 en Debian 13. Cada vez que lo intento, un mensaje me dice: "Your Firefox profile cannot be loaded. It may be missing or inaccessible". En efecto, estuve tocando la configuración de perfiles para migrarlos desde una copia de seguridad y algo debí de hacer mal por despiste. Para aligerar, desinstalé completamente el programa con remove --purge / clean / autoclean / autoremove y lo volví a instalar de nuevo, pero el problema persiste. Es como si quedara algún rastro de la antigua instalación. Desinstalado de nuevo, intenté buscar la carpeta oculta de Mozilla Firefox, que eliminé; pero al instalar de nuevo el navegador, el problema persistía. ¿Qué sucede? ¿Alguien me puede echar un cable? Gracias y saludos.

When I open Firefox, I get Welcome to Firefox each time. I asked this question earlier and received this response:

This sounds like Firefox is not saving the profile/setup changes between launches. I’d check that Firefox isn’t running in a temporary/new profile and that the profile folder is writable.

You could also try creating a new Firefox profile and see whether it launches normally there.

I do not know how to do any of this, especially since I cannot open Firefox. Please advise.

Thank you.

all tabs failing to play; is this a profile grep e unlock issues; GROK 5 linux ubuntu link action: terminal commands: ps aux | grep -i firefox ; kill -9 those PIDS; is the number one cause of firefox silently failing to relaunch after a hard kill

Since the latest Firefox update, it hangs immediately at startup. Now it never works, while other browsers always work. This is a fully updated Windows 10 computer. Even when it does work, Firefox's special tabs - About, Close Firefox, Restore session - are often big trouble; and it seems possible one of these may be the problem now. When Firefox is working. it either closes slowly or not at all, bringing always problematic "Firefox is already running - Close Firefox" messages. When one Firefox window is closed, Firefox always keeps the window that is causing trouble in the first place. So, two things. 1) Firefox doesn't work at all. If you fix this problem with an update, the update must start immediately because clicking on "Download Update" too will be hung. 2) You have terribly problematic special tabs which I have named above. It is my opinion that you cannot fix them - you have to rebuild them from scratch - otherwise they would be working properly right now. I have fallen back on Microsoft Edge which always works. Firefox is never working. Think about it.