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Failed to read configuration file

We are currently having to role back to FireFox ESR 52.9 from the latest Quantum build of FireFox 60.3.0. Due to the fact that this version utilizes WebGl 2. Our older sy… (மேலும் படிக்க)

We are currently having to role back to FireFox ESR 52.9 from the latest Quantum build of FireFox 60.3.0. Due to the fact that this version utilizes WebGl 2. Our older systems will not render one of the educational games we utilize in the our School District any longer due to the fact that Quantum uses WebGl 2 instead WebGl 1. We have tested and verified that ESR 52.9 renders the game properly.

I have been trying to disable the automatic update in utilizing the user.js file and the cfg file. The computers are apart of the domain. From what I have read only new user profiles will get the new user.js settings while all existing profiles will retain the old settings so we plan on reimaging these computers so all existing profiles will be wiped.

I have also seen users block the updates by changing the Host File which we will not do. Some sites state create a profile folder in the defaults folder other show place the user.js file in the pref folder. So I am lost at this point. I have followed this guide as well:

https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Enterprise_deployment_before_60#Changes_Over_Time

I have placed the 00_admin-prefs.js with the exact settings shown and have the mozilla.cfg file in the same folder as the js. both are in the defaults\pref

When trying to run FireFox I am am not getting:

Failed to read the configuration file. Please contact your Administrator. (I am the Admin). My domain creds give me admin privileges on all computers.

I know this folder also holds the channel-pref.js so I am not sure if I can add what I need to that file.

If someone would please help me determine what is going on. Why wont firefox copy the either a user.js file or utilize the cfg file I created to each new profile that gets created when logging into the computer.

Asked by fharris77 1 வருடத்திற்கு முன்பு

Answered by fharris77 1 வருடத்திற்கு முன்பு

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when ever I run Firefox.exe I get an error of "The data is invalid" but if I rename firefox.exe to firefox1.exe it runs with no problems.

Ever since Firefox nightly did an update a few days ago, I have been unable to run it from the normal shortcut. I had to make a copy of the exe and rename it and only the… (மேலும் படிக்க)

Ever since Firefox nightly did an update a few days ago, I have been unable to run it from the normal shortcut. I had to make a copy of the exe and rename it and only then would it work from the renamed file. If I click a link in Thunderbird, for example it still looks for Firefox.exe and not the renamed file. If I change the tile to Firefox.exe.bak so that only Firefox1.exe is accessible, I still have to run it manually from that new file name rather than the default. This is a new install of Windows 7 x64 Ultimate and this is the only time I have ever had problems with nightly. Now, when I restart the browser, it downloads a new firefox.exe and the error returns. I would rather try and fix the problem than remove all traces of it then reinstall, that would be like ignoring the problem and starting over which won't 'fix' the error that others might have.

Asked by tallon1999 1 வருடத்திற்கு முன்பு

Answered by tallon1999 1 வருடத்திற்கு முன்பு

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Under Wndows XP, Firefox will no longer start, and won't reinstall or install

I had been running the latest version (52.8) of Firefox supported under Windows XP, but now I can no longer run Firefox, and, worse, cannot reinstall it. On June 7, Fire… (மேலும் படிக்க)

I had been running the latest version (52.8) of Firefox supported under Windows XP, but now I can no longer run Firefox, and, worse, cannot reinstall it.


On June 7, Firefox lost all the tabs from the previous day. This happens from time to time, and it's simplest first to try restoring Windows to the previous checkpoint: this is sometimes successful in that Firefox then does display tabs. I restored Windows to the then most recent checkpoint, June 6, only to find the attempted cure worse than the disease: Firefox would not even start. There were no messages of any type.

Attempts either to create a new Firefox profile (-p) or to start Firefox in safe mode (Shift) were no different. Windows Task Manager showed no evidence, however transient, of either any Application or Process for Firefox. Again, there were no messages of any type.

Restoring Windows to still earlier dates produced the same situation: Firefox would not run, exactly as after the initial restoration.

Deleting the (only) Firefox profile made no difference.


All subsequent attempts to reinstall Firefox--whether or not Firefox had been uninstalled--have been equally unsuccessful, and equally mute.

Program Firefox Installer.exe (306 KB in size, downloaded from https://stubdowloader.cdn.mozilla.net, for example) begins a process which occupies either 2,484KB or 2,488KB of storage, but which does nothing. I tried several Firefox installers (all downloaded via various links from Mozilla): all are bit-for-bit identical, albeit with one occasional exception, i.e., sometimes a string is "duckduckgo.", and sometimes it's "getfirefox-". None of these installers produces any message, and each creates a process which occupies c. 2.5MB and then does nothing.

Knowing that it would not run successfully under Windows XP, I nonetheless tried later Firefox installers (e.g., Firefox Setup 60.0.2.exe downloaded from https://download-installer.cdn.mozilla.net). Rather than my receiving the expected message saying that 60.0.2 isn't supported on Windows XP, this installer, too (once it's used some amount of both CPU and storage), is simply suspended occupying 2,544KB and staying silent.


The following may or may not be relevant.

1. Running any of these installers (and also firefox.exe itself) from a CMD window confirms instant termination. Even from the CMD window, it remains the case that the installers create a process occupying c. 2.5MB. (I didn't try Firefox Setup 60.0.2.exe from the CMD window.)

2. Things are essentially the same in Windows Safe Mode, with the following differences. (a) The 306 KB installers occupy slightly less storage: c. 2.2 MB instead of c. 2.5 MB. (2) Clicking on the Firefox shortcut and selecting "Run As" with the same account produces the message "A device attached to the system is not functioning"; a 'Web search for his message turns up nothing relevant.


The current situation is that Windows was restored to the most recent checkpoint, June 6, as in the second paragraph (although obviously Windows has taken later checkpoints, so that the June 6 checkpoint has been overwritten), and Firefox is installed. Firefox still won't run, and none of the installers produces any output.

FWIW, I'd wondered whether Firefox might simply be refusing to run any longer on Windows XP, but recent tests show that the Firefox-based TOR browser runs from a memory stick just as normal.

Asked by Chester_Babcock 2 ஆண்டுகளுக்கு முன்பு

Answered by Chester_Babcock 2 ஆண்டுகளுக்கு முன்பு

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Since I downloaded Firefox I cannot launch Safari and it is my default browser

When I click and hold on the compass icon I am asked to "force quit". I cannot launch Safari and before I downloaded Firefox I could. I only downloaded firefox because I… (மேலும் படிக்க)

When I click and hold on the compass icon I am asked to "force quit". I cannot launch Safari and before I downloaded Firefox I could. I only downloaded firefox because I registered for classes at a community college and they said to use Firefox and not Safari. I would like to dump firefox now.

Asked by Neeters42 2 ஆண்டுகளுக்கு முன்பு

Answered by FredMcD 2 ஆண்டுகளுக்கு முன்பு

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Migrate Firefox 59.0.1 profiles/user data to ESR using account sync

We have a client that used to run on local computers running the latest ESR version, they recently changed to a terminal server environment and during the setup 59.0.1 ma… (மேலும் படிக்க)

We have a client that used to run on local computers running the latest ESR version, they recently changed to a terminal server environment and during the setup 59.0.1 made it onto their new setup. Multiple issues have arisen that were not present on the old system and we need to move them back to the ESR version on the terminal server environment. I read online that you cannot just directly import any profile versions 55.0 and up to earlier versions so I am asking if I can instead use a mozilla account to sync over their data instead without causing a catastrophe, and if anyone happens to know what I might expect afterwards if this could potentially work.

Asked by stacheman 2 ஆண்டுகளுக்கு முன்பு

Answered by cor-el 2 ஆண்டுகளுக்கு முன்பு

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Can't make Firefox my default browser as it's NOT listed in Choose an App.

I have to use Windows 10 (Home v:1703). I'd like Firefox to be my default browser, but it's not listed in 'Choose an App'. There's just Microsoft Edge listed, along with… (மேலும் படிக்க)

I have to use Windows 10 (Home v:1703).

I'd like Firefox to be my default browser, but it's not listed in 'Choose an App'.

There's just Microsoft Edge listed, along with Internet Explorer, and an option to choose an app from the shop.

Microsoft Edge is also presumptuously shown as the default app to start with.


If Firefox isn't listed, how can I set it to be my default browser - or, isn't this 'allowed' in Windows 10 ?

Asked by Catherine Barber UK 2 ஆண்டுகளுக்கு முன்பு

Answered by alan_r 2 ஆண்டுகளுக்கு முன்பு

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I follow the How to Download and Install Firefox on Mac instructions but only get an empty page at the end of the process.

Several days ago, my Firefox stopped working. I would get this response: Hmm. We're having trouble finding that site. We cannot connect to the server at package.onesear… (மேலும் படிக்க)

Several days ago, my Firefox stopped working. I would get this response: Hmm. We're having trouble finding that site. We cannot connect to the server at package.onesearch.org. I tried quitting Firefox and re-opening - with same result. I tried removing all Firefox software/icons from my Mac (Version 10.13.3) and downloading Firefox 58.0.2.dmg and followed the How To Download and install Firefox on Mac instructions, but the end result was a blank page from package.onesearch.org/ followed by a lot of characters. I did notice that the steps the download took me through differed in many ways from the How to Download instructions just mentioned above. When I try the Troubleshooting Information - Automatically add button, it takes me to an Add Ons screen with We're sorry, but we can't find what you are looking for. When I try "try these manual steps", there is no menu item called Help. In fact, there are no menu items at all. This is very frustrating. I am not tech savvy. I am 70 years old and live in Lexington, Nebraska, USA.

Asked by dlynnwg 2 ஆண்டுகளுக்கு முன்பு

Answered by FredMcD 2 ஆண்டுகளுக்கு முன்பு

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Firefox don't launch at all.

Hi guys,yesterday after my computer froze and forced to restart it with the reset button,my firefox don't launch at all.I click the program,i see the blue circle by the c… (மேலும் படிக்க)

Hi guys,yesterday after my computer froze and forced to restart it with the reset button,my firefox don't launch at all.I click the program,i see the blue circle by the cursor but nothing happens.Only thing is I see the program "running" at task manager but it never launce.Windows 10 last built with all updates,latest firefox.I did the flushdns trick,didn't help.Thanks in advance.

Asked by LouCi4er 2 ஆண்டுகளுக்கு முன்பு

Answered by FredMcD 2 ஆண்டுகளுக்கு முன்பு

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Antivirus deletes firefox.exe

Hello there. I tried to update Firefox to 58.01, but since updating my antivirus appears to block the firefox.exe. I uninstalled Firefox completely, then tried to reinsta… (மேலும் படிக்க)

Hello there. I tried to update Firefox to 58.01, but since updating my antivirus appears to block the firefox.exe.

I uninstalled Firefox completely, then tried to reinstall it but again my antivirus blocked it before I could open firefox.exe

I reinstalled Firefox again, this time disabling my antivirus and Firefox.exe appeared to work again, I was browsing and redownloading my addons. Once the antivirus enabled itself again after 10 minutes, the same problem happened. Firefox shortcuts couldn't find the Firefox.exe, and in the main Mozilla folder, firefox.exe had become firefox.exe.sig

When trying to uninstall it after this happens, I can't uninstall it through normal procedures unless I rename firefox.exe.sig to firefox.exe (which is also unable to run, says it isn't the proper version when it is)

Would appreciate some help here, thank you

Asked by madeste 2 ஆண்டுகளுக்கு முன்பு

Answered by madeste 2 ஆண்டுகளுக்கு முன்பு

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I accidently deleted my firefox.exe. how do it put back on my computer??? :(

I was getting annoyed with firefox constantly sending me updates when I just updated it last month. So stupid me deleted my firefox.exe and now I can't reupload anything… (மேலும் படிக்க)

I was getting annoyed with firefox constantly sending me updates when I just updated it last month. So stupid me deleted my firefox.exe and now I can't reupload anything firefox. please help me.

Asked by dmc1967 2 ஆண்டுகளுக்கு முன்பு

Answered by FredMcD 2 ஆண்டுகளுக்கு முன்பு

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Firefox 56/57 for Mac crashes on startup - every time. (Despite clean reinstall)

Hi all, I rely heavily on FireFox (primarily for the multiple profiles and extensions it provides), so deperately trying to solve a problem I'm having. When I launch Fire… (மேலும் படிக்க)

Hi all,

I rely heavily on FireFox (primarily for the multiple profiles and extensions it provides), so deperately trying to solve a problem I'm having. When I launch Firefox on my Mac (10.12.6 - Sierra), I immediately receive an error: "Firefox quit unexpectedly."

I've tried a number of different approaches to resolve including:

1) Starting Firefox in safe mode (by holding down the opt key on launch) - same error occurs 2) Removing Firefox from the Applications folder, and removing Firefox folder from the Application Support folder under the Library (which also removes all my profiles). Then reinstalled Firefox 57. - same error occurs 3) Tried installing older version of Firefox - version 56.0.2 (after removing previous installation as per step 2 above) - same error occurs 4) Tried a machine restart (very early on) - same error occurs.

I've run out of ideas, and hoping someone may be able to shed some light or suggest further troubleshooting options? Desperate to get it working again!

Cheers, Mark

The detailed error report (or at least the start of it) is here:

Process: firefox [1511] Path: /Applications/Firefox.app/Contents/MacOS/firefox Identifier: org.mozilla.firefox Version: 56.0.2 (5617.10.24) Code Type: X86-64 (Native) Parent Process:  ??? [1] Responsible: firefox [1511] User ID: 1342407268

Date/Time: 2018-01-08 14:25:11.798 +1100 OS Version: Mac OS X 10.12.6 (16G1114) Report Version: 12 Anonymous UUID: C6B6E4AB-1DE7-8875-3841-965087F69AAD


Time Awake Since Boot: 820 seconds

System Integrity Protection: enabled

Crashed Thread: 1

Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x0000000106f5bc92 Exception Note: EXC_CORPSE_NOTIFY

Termination Signal: Segmentation fault: 11 Termination Reason: Namespace SIGNAL, Code 0xb Terminating Process: exc handler [0]

Asked by ms1900 2 ஆண்டுகளுக்கு முன்பு

Answered by ms1900 2 ஆண்டுகளுக்கு முன்பு

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When i downloaded your browser it already had malware in it. I can't use firefox unless you get assure me it does not come with malware.

Firefox had malware in it that defeats my ability to get rid of it. So I got rid of firefox and decided to download a whole new updated firefox. And it had the same mal… (மேலும் படிக்க)

Firefox had malware in it that defeats my ability to get rid of it. So I got rid of firefox and decided to download a whole new updated firefox. And it had the same maleware in it! That cryptosearch engine or whatever it is. And I cannot get rid of it no matter what. Even new Firefox the cryptosearch engine is in it already! How can this be fixed?

Asked by marbirns 2 ஆண்டுகளுக்கு முன்பு

Answered by FredMcD 2 ஆண்டுகளுக்கு முன்பு

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I have a computer with a 60G flash drive and i ned to transfer Firefox to E\ on the same computer how can i do this

Need to shift Firefox to another drive. I have a computer with a 60G flash drive as C\ drive and a 1TB E\ drive. When using Firefox the flash drive is at capacity which s… (மேலும் படிக்க)

Need to shift Firefox to another drive. I have a computer with a 60G flash drive as C\ drive and a 1TB E\ drive. When using Firefox the flash drive is at capacity which slows everything down so I need to reserve the C\drive foe widows Can I reinstall Firefox on the E\ drive and will it then use that drive. If so how can I load Firefox to the E\ drive as there appears no way of changing the drive when loading.

Asked by Leerx4 2 ஆண்டுகளுக்கு முன்பு

Answered by FredMcD 2 ஆண்டுகளுக்கு முன்பு

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Firefox crashes

Hello, I've been trying to install the latest firefox on my pc running windows 7 home premium, 64bit. I have cleaned the pc with ccleaner, run mutiple scans with malware… (மேலும் படிக்க)

Hello, I've been trying to install the latest firefox on my pc running windows 7 home premium, 64bit. I have cleaned the pc with ccleaner, run mutiple scans with malwarebytes and commodo antivirus, uninstalled old firefox programs and deleted as many junk files and programs that I could find. I have also tried to download with Expolorer rather than Chrome ...All to no avail. The following message details accompany the window which displays.. "firefox has stopped working", and firefox never opens to get to a "safe mode". I have used firefox up until a few weeks ago when an upgrade attempt failed. I would really like to use firefox again, but can't seem to resolve this issue. Your help would be much appreciated. Joe


Problem signature:

 Problem Event Name:	APPCRASH
 Application Name:	firefox.exe
 Application Version:	57.0.2.6549
 Application Timestamp:	5a2846ff
 Fault Module Name:	StackHash_cbb0
 Fault Module Version:	0.0.0.0
 Fault Module Timestamp:	00000000
 Exception Code:	c0000005
 Exception Offset:	000000006fff0d2a
 OS Version:	6.1.7601.2.1.0.768.3
 Locale ID:	1033
 Additional Information 1:	cbb0
 Additional Information 2:	cbb0a0f748726801023e51fb7e1bdee0
 Additional Information 3:	0f94
 Additional Information 4:	0f9406f691682c10e90b6948a11b9541

Asked by joechanman 2 ஆண்டுகளுக்கு முன்பு

Answered by FredMcD 2 ஆண்டுகளுக்கு முன்பு

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Links from external programs don't open in Firefox 54. It just opens up a window with my home page.

Hello I recently downloaded the latest version of Firefox 54 for Linux. Everything worked great however even after making it the default browser links from external progr… (மேலும் படிக்க)

Hello I recently downloaded the latest version of Firefox 54 for Linux. Everything worked great however even after making it the default browser links from external programs such as Pidgin won't open in a new tab in firefox. Instead a new window will pop-up with my home page. I've tried solving it by uninstalling the other version of firefox I downloaded from the repository (Firefox 45)

I fear it might be because I didn't really install it, instead I just ran the file directly form the download labed just firefox. It seems to be working fine and there was no README file so I assumed that was the way it should've been done.

Asked by AnimatedFreak 3 ஆண்டுகளுக்கு முன்பு

Answered by bygabyga 3 ஆண்டுகளுக்கு முன்பு

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Many pages are too wide; CTRL and + or - does not help

I finally uninstalled Chrome and put in Firefox. Haven't used it in years. On my screen most pages are "wide" -- so a horizontal scroll bar appears at the bottom of the p… (மேலும் படிக்க)

I finally uninstalled Chrome and put in Firefox. Haven't used it in years.

On my screen most pages are "wide" -- so a horizontal scroll bar appears at the bottom of the page, and to see the very right hand side of the page, I have to scroll over.

I have tried the CTRL and - but all that does is shrink the text on the page. It doesn't make everything actually fit on the page horizontally. See the uploaded images of a question I found on this topic on this forum. Even though I've shrunk the font size down in the second one, I still see the horizontal scroll bar at the bottom. Even if I shrink it all the way to the minimum (which results in a tiny font I can't see), some of the page appears off-screen and has to be scrolled over to be seen.

I have tried for an hour to fix this and there doesn't seem to be any way. HELP!

Asked by ianchama 3 ஆண்டுகளுக்கு முன்பு

Answered by jscher2000 3 ஆண்டுகளுக்கு முன்பு

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How can we get Mozilla to support Firefox, or write Firefox, for Windows 10 phones?

I can find mo Firefox app for Windows 10 phones. I am informed that such does not exist. How can we get Mozilla to support Firefox, or write Firefox, for Windows 10 phone… (மேலும் படிக்க)

I can find mo Firefox app for Windows 10 phones. I am informed that such does not exist. How can we get Mozilla to support Firefox, or write Firefox, for Windows 10 phones?

Asked by dwat 3 ஆண்டுகளுக்கு முன்பு

Answered by Seburo 3 ஆண்டுகளுக்கு முன்பு

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I have Firefox 55.0.3 (64 bit). When trying to install an add-on it downloads but gets stuck on verification. This happens on all add-ons.

Since upgrading to the latest version I am trying to find replacements for the newly disabled add-ons. I first tried this on Friday the 8th. The same problem has been hap… (மேலும் படிக்க)

Since upgrading to the latest version I am trying to find replacements for the newly disabled add-ons. I first tried this on Friday the 8th. The same problem has been happening all weekend including today and I imagine since I installed this version. The exact wording is downloading and verifying add-on.

Asked by ronsalma 3 ஆண்டுகளுக்கு முன்பு

Answered by FredMcD 3 ஆண்டுகளுக்கு முன்பு

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error msg 55.03 not comp w/min>55.02, max<55.02?

Been a Firefox user for yrs, this afternoon, auto update runs while trying to open browser and then a get an error box popping up titled XULRunner. Msg states Error: Plat… (மேலும் படிக்க)

Been a Firefox user for yrs, this afternoon, auto update runs while trying to open browser and then a get an error box popping up titled XULRunner. Msg states Error: Platform version '55.0.03' is not compatible with minVersio>=55.0.2 maxVersion<=55.02. I have no idea what that means or how to fix it so I can go back to using Firefox and getting access to my bookmarks. Pls help. Thanks-Aaron

Asked by aaron1978 3 ஆண்டுகளுக்கு முன்பு

Answered by cor-el 3 ஆண்டுகளுக்கு முன்பு