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"Entry point could not be located in xul.dll"; Firefox crashes on startup after update, installer also fails.

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\Mozil… (read more)

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.

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Firefox is stuck in a loop and will not open.

Firefox on Windows 11. When I try to open Firefox I get a message that Firefox is already running, but is not responding. The old Firefox process must be closed to open a… (read more)

Firefox on Windows 11. When I try to open Firefox I get a message that Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window. Close does nothing, Task manager - end process does not close. Stuck in a permanent loop here. Rhonda

Open 1 41

Mozilla Firefox - Version 115 on Window 7 not working?

Beginning with September 2026, Mozilla Firefox browser - version 115 - does not work on Win7 anymore, although mozilla.org says that it should work until March 2027. Any … (read more)

Beginning with September 2026, Mozilla Firefox browser - version 115 - does not work on Win7 anymore, although mozilla.org says that it should work until March 2027. Any explanation or solution? (I won't use Win10 or later versions ever.)

The problem: Version 115 can be installed, but after that Firefox browser does not work at all. Not only as internet browser, but even "settings" cannot be open. It's a dead program.

I installed Maxthon instead of Mozilla, because the Chinese browser supports Win7. This older version of the Windows is still perfect (!) for everything I use: internet, videos, Open Office, etc. However I have to select between ad blockers and browsers. My printers also works on this version of Windows.

When I cannot use Win7 anymore on the internet I will choose Linux instead of Win10 or later versions.

Open 2 10

not working, rather Firefox, but

I've rebooted, even did a hard reboot, total 3 times, tried system restore, 1 hour past update, deleted Firefox, reinstalled, still "in use", deleted Norton, still same. … (read more)

I've rebooted, even did a hard reboot, total 3 times, tried system restore, 1 hour past update, deleted Firefox, reinstalled, still "in use", deleted Norton, still same. Reinstalled norton. There NO BUTTON, SWITCH, there! I can File, new blank page, still nothing. Sort of reminds me of automakers, all look alike! Left side, simple, turn on sc or import, at the opening first time, import short cuts and bookmarks from previous page, turn off Newsweek. Simple, without the hassle of now, those that have cleared, happy for you! For me same thing at the top, yellow bar, "in use!"

Open 4 30

My fresh Firefox installation crashes on Ubuntu 26.04 LTS

I've installed Firefox on my Ubuntu installation (on USB) but for some reason, it doesn't work. First time i tried opening it, just said it crashed/closed unexpectedly, a… (read more)

I've installed Firefox on my Ubuntu installation (on USB) but for some reason, it doesn't work. First time i tried opening it, just said it crashed/closed unexpectedly, and all of the other tries i've now attempted, still don't work. Maybe it's because i'm running my Ubuntu on a USB? (sob) I don't really know, can someone help?

Open 1 10