Firefox Community Forum

Greetings, Team. When Firefox does an Auto-update while starting, an error message arrives, " NSIS Error:

Error writing temporary file. Make sure your temp folder is valid.

OK " Please, where and what name does this 'temp folder' have?

How may I fix this Error?

Thank y'all in advance. Phil T. ps W10, Chkdsk OK, system appears OK.

Ok so a month ago FF updated on four W11 laptops and now every time since then when you open FF it wants to make changes to your HDD and then tells you it can't download the latest version. I've uninstalled it and reinstalled it and its the same across all devices. None of the three devices are running any of the same software aside from the OS as they're all dedicated to different purposes, so I know its not something on the devices themselves. We ended up uninstalling it on everything aside from the older W10 desktop because its a constant nuisance. Each time it updates it is successful and there's no failure messages, so it's not like its obviously failing to update, but something certainly broke.

火狐浏览器更新后会自动清除C盘用户下的所有文件，安全软件阻止都阻止不了，下面是记录，已经被清除2次了，对火狐已经不爱了。

防护项目：启动目录(扩展保护) 目标文件：C:\Users\一个菠萝丶\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup 操作结果：已阻止 进程ID：17268 操作进程：C:\Program Files\Mozilla Firefox\firefox.exe 操作进程命令行："C:\Program Files\Mozilla Firefox\firefox.exe" --backgroundtask removeDirectory C:\Users\ "" 0 * --metrics-id Quota 父进程ID：14652 父进程：C:\Program Files\Mozilla Firefox\firefox.exe 父进程命令行："C:\Program Files\Mozilla Firefox\firefox.exe"

防护项目：启动目录(扩展保护) 目标文件：C:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp 操作结果：已阻止 进程ID：10652 操作进程：C:\Program Files\Mozilla Firefox\firefox.exe 操作进程命令行："C:\Program Files\Mozilla Firefox\firefox.exe" --backgroundtask removeDirectory C:\Users\ "" 0 * --metrics-id Quota 父进程ID：13088 父进程：C:\Program Files\Mozilla Firefox\firefox.exe 父进程命令行："C:\Program Files\Mozilla Firefox\firefox.exe"

I'm too old and tired to try to find my way around the new update. How can I return to the previous version? Life was so simple. Now I spend more time trying to find things that I can't find than I do online doing something productive.

Please tell me there's a simple way to get back to the previous version and that I won't lose my bookmarks and links.

I'm trying to open a file that was sent to me, but my computer is asking me to update Firefox. When I try to do that, it shows that I already have the most current update.

The Firefox update I was prompted to initiate on May 12 resulted in a compatibility issue message. Following Firebox Help recommendations, I re-installed my Firefox. Now I see that my downloads folder has a long string of unfamiliar files, and I need assurance that these are not remnants of malicious activity. All files have names like i-33639-002-XX.jpg and are dated the same time (5/12/2026, 4:07 PM). Each file shows as “0 KB” in size. All are listed as “JPG File”. Has this happened to other Firefox users?

I am getting the message "updates are disabled by the admin." I am the only one here so I don't know how that happened. I need to install Slack but need to update first. I followed the steps to edit registry but still can't update. Please advise.

How do I update Firefox on my rand McNally tablet When I factory reset it ,it went back to the original version and I can't get it to update to the version I had beforehand

I have deployment firefox 148.0.2 version from SCCM, its on autoupdate. So, when it is pushing to machine and during launch its giving prompt " You have launched olderversion of firefox ". even though i have cleared old version or any other version and then pushed still giving same prompt. We need to remove this prompt from appearing to users. kindly suggest how to fix

Since I upgraded from FF128-esr to FF140-esr I always get the "Firefox is being updated by another instance" This is really driving me crazy, as I checked / did / .... everything (and even more) I found on the internet related to that.

Nothing helps !

Creating and using a new default profile didn't help

Finally I ended up uninstalling FF completely (making sure no -zero- leftovers remained in ProgramFiles, AppData a.s.o.), and reinstalled FF140.7.0-esr freshly. After installation I started FF immediately with the created default profile (only existing one) --> SAME THING : "Firefox is being updated by another instance"

And this is really a FF140 thing, when I go back to FF128, on the same computer, same profiles, ...., the problem is gone.

I would like to know in detail what checks are really done by FF to decide to give that "Firefox is being updated by another instance"