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<window id="main-window

Hello everybody, i have just finished a big long windows update and since then i cannot open the firefox browser. Even if i download a new firefox version i cannot open i… (read more)

Hello everybody, i have just finished a big long windows update and since then i cannot open the firefox browser. Even if i download a new firefox version i cannot open it: In the 2 instances, a window pops up with this message "<window id="main-window". Thank you for your time and your help. Patrick

Asked by Pat777 1 year ago

Answered by cor-el 1 year ago

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Firefox won't load pages

After Firefox updated to 67 it won't load any pages. Chrome and Opera both work normally. I went through all the recommendations including the firewall changes, disabli… (read more)

After Firefox updated to 67 it won't load any pages. Chrome and Opera both work normally. I went through all the recommendations including the firewall changes, disabling IPv6, etc. and there was no difference.

Asked by stevemp 1 year ago

Answered by stevemp 1 year ago

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you auto updated and now I have lost all bookmarks and function of foxfire

Foxfire auto updated the program and it lost all bookmarks and even login. The result is I cannot do anything with my computer that needs the internet. I have spent man… (read more)

Foxfire auto updated the program and it lost all bookmarks and even login. The result is I cannot do anything with my computer that needs the internet. I have spent many hours trying the suggested fixes and I cannot get them back and I do not have my password so that I cannot change if for fear I will loose access to the bookmarks. There seems to be no accountability from Mozilla and no way to reach any one. Is anyone else having this problem.

Asked by TerrelF 1 year ago

Answered by jscher2000 1 year ago

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"Refresh" stopped app working and now get a message when I try open the app saying copy of forefoot is already open which it is not.

I like Firefox but sad to say that I have increasinlt wasted much time lately with its crashy ways and I made the mistake of using Refresh today. Now get a message when … (read more)

I like Firefox but sad to say that I have increasinlt wasted much time lately with its crashy ways and I made the mistake of using Refresh today.

Now get a message when I try open the app saying "copy of firefox is already open" which it is not true and it is not showing as running on the system.

I have tried reinstalling and it makes no difference.

I dont have an IT engineering degree but how do I fix this before I just give up and walk away? Thanks.

Asked by exasperatedagain 1 year ago

Answered by exasperatedagain 1 year ago

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Firefox crashes

hi i have a .... to me ... big problem. firefox will not even start and stay up. i can hardly even get the crash message up and the widow goes away. firefox just crash… (read more)

hi i have a .... to me ... big problem.

firefox will not even start and stay up. i can hardly even get the crash message up and the widow goes away.

firefox just crashes before its had a chance. downloaded new and same thing happens. a crash report comes up but i can't get the report written before its gone.

installed new version of mozilla. still persists

so i followed the prompts form here, "You should copy the Report IDs for submitted crash reports (they start with bp-) to your support question in the Community Support forum."

and i get this, Crash ID: bp-74f92cba-0ebf-43ba-a7bc-2a1871171126

can you help me pls. thnx brian

Asked by just plain old brian 1 year ago

Answered by FredMcD 1 year ago

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I am stuck using v 64.0.2, Firefox 65 is unuseable.

FireFox ver 64 works flawlessly, but v 65 will not run on my machine no matter what I have tried! Symptoms with v65: Intermittently does not start, hit icon again then lo… (read more)

FireFox ver 64 works flawlessly, but v 65 will not run on my machine no matter what I have tried!

Symptoms with v65:

Intermittently does not start, hit icon again then loads but doesn't connect. Very slow when it loads. firefox.exe does not unload from memory, has to be shut in task manager

What I have tried so far;

FireFox refresh. unstall / reinstall uninstall uBlock Origin sfc /scannowall uninstall Avast uninstall VPN Delete all firefox files on system disk + delete all registry entries then reinstall. Install from full version .exe Removed VPN (Private Internet Access) Updated Windows and any and all drivers.

What am I missing ?

TIA, George...


Windows 7 Pro MB: Asus P8Z77-V LK - Z77, Intel Ivy Bridge Intel i7-3770K @ 4.3Ghz Corsair Hydro Series High Performance Liquid CPU Cooler H60 32GB (DDR3-1600 DDR3 SDRAM) NVIDIA GeForce GTX 980 Ti 6GB

Asked by George 1 year ago

Answered by George 1 year ago

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Your Firefox profile cannot be loaded, even after new installation on OS 10.14.3

I had Firefox 62.0.2 running on my Mac, with extensions like Ad Blocker and Translations, but as it was real real slow, I had asked to run without extensions, and the nex… (read more)

I had Firefox 62.0.2 running on my Mac, with extensions like Ad Blocker and Translations, but as it was real real slow, I had asked to run without extensions, and the next time it responded with the "Your Firefox profile cannot be loaded. It may be missing or inaccessible." so I had followed all the advice published on the www, but after 2 days, found none of the answers and suggestions is working or is applicable, so I had implemented few removals and new installations of the application - but, always getting the same famos ”Your Firefox profile cannot be loaded. It may be missing or inaccessible." and A Freeze during the "verification of firefox.app" each time, on completely new installation!

In fact, the Firefox/extensions folders were never created on my Mac (On new install, as well) but the application was working for a long time, and there was/is a Mozilla folder which seems to hold my Chrome (add-ons) but no Firefox folder exists on this and my other Mac in the Library/Application Support.

I even removed my Chrome and reinstalled it to see if it can be done, and there was no problem in new Chrome installation - as it is with Firefox 62.0.2

Asked by Amnon 1 year ago

Answered by cor-el 1 year ago

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Your profile cannot be loaded still after uninstall

When I tried to start Firefox after it had crashed i got the "Your profile cannot be loaded" error. I to reinstall it but the error persisted. I then googled and found th… (read more)

When I tried to start Firefox after it had crashed i got the "Your profile cannot be loaded" error. I to reinstall it but the error persisted. I then googled and found that you could remove profiles.ini and ~/.cache/mozilla/. I've removed both of these as well as reinstalling Firefox multiple times.

But it still show the error message. It even "spread" to Thunderbird.

I'm using macOS Mojave 10.14.

Asked by ntoonio 1 year ago

Answered by ntoonio 1 year ago

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Firefox 65 stays in memory

I noticed that firefox stays in memory after I close it. In fact, If I open and close firefox 10 times, ten processes are shown in memory, each consuming around 100Mb. I'… (read more)

I noticed that firefox stays in memory after I close it. In fact, If I open and close firefox 10 times, ten processes are shown in memory, each consuming around 100Mb.

I'm using Windows 7 in my corporate computer and I have been using Firefox 65.0.1 x64. I've tried to use it in safe mode (no add-ons) and problem persisted. I uninstalled it, deleted all Mozilla data in AppData and ProgramData and reinstalled it fresh. The problem persisted.

Then I installed the 32-bit version of Firefox and the problem is no more. Is it a bug that has to be fixed or some setting that shoudn't be enabled?

Thank you.

Asked by nelsonwcf 1 year ago

Answered by nelsonwcf 1 year ago

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How do I stop recurring registry errors from returning and slowing down my computer?

Hi all. Seems like after updates, my computer slows down. It has become so recognizable, I know when the registry errors appear, as my computer performance falls off. … (read more)

Hi all. Seems like after updates, my computer slows down. It has become so recognizable, I know when the registry errors appear, as my computer performance falls off. I must use Reginout Registry cleaner, and CC Cleaner to restore performance. Along with any FireFox updates, my bookmarks have all been deleted many times over. I no longer attempt to re-install, as they continually get deleted, and so simple fix is available to me that I can understand. Thank you.

Asked by a3wayat 1 year ago

Answered by Chris Ilias 1 year ago

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I can't finish the download.

I've tried to add Firefox to my computer. I entered my email address, a user name and a password. I downloaded Firefox to my iPhone. However, Firefox isn't in my applicat… (read more)

I've tried to add Firefox to my computer. I entered my email address, a user name and a password. I downloaded Firefox to my iPhone. However, Firefox isn't in my applications on my computer, so I can't open it or use it. Please help me complete the download.

Asked by christophergibbs331 1 year ago

Answered by James 1 year ago

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I cannot install Firefox. I use Windows 7. I've tried to install Google Chrome and Opera. I could not install these browser either.

This is the message I get: XML-parsefout : onjuist gevormd Locatie: chrome://browser/content/browser.xul Regelnr.:3652, kolom 33: keepbroad#astttributeswhen-customizing=… (read more)

This is the message I get:

XML-parsefout : onjuist gevormd Locatie: chrome://browser/content/browser.xul

Regelnr.:3652, kolom 33:

keepbroad#astttributeswhen-customizing="true"

Asked by G.A.de.Jager 1 year ago

Answered by binaryninja 1 year ago

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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… (read more)

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 year ago

Answered by fharris77 1 year ago

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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… (read more)

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 year ago

Answered by tallon1999 1 year ago

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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… (read more)

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 years ago

Answered by Chester_Babcock 2 years ago

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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… (read more)

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 years ago

Answered by FredMcD 2 years ago

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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… (read more)

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 years ago

Answered by cor-el 2 years ago

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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… (read more)

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 years ago

Answered by alan_r 2 years ago