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How do I fix Firefox not opening?

I had two profiles, was in the process of trying to learn how to use the 2nd profile (as seen in the link below), which I still have no answer for. Somehow, maybe I held… (tuilleadh eolais)

I had two profiles, was in the process of trying to learn how to use the 2nd profile (as seen in the link below), which I still have no answer for. Somehow, maybe I held down SHIFT for too long and clicked on something by accident, idk, but somehow, I ended up REFRESHING the 2nd profile, causing it to delete everything I had done with it, and it backed up the old profile onto my desktop in the process. I figured I could just simply delete the new profile folder it had created and put back my old profile in the profile folder, but now, Firefox will not open at all, saying "Your Firefox profile cannot be loaded. It may be missing or inaccessible." How do I get it to recognize the profile folders again? OMG, I'm using Microsoft Edge, please, get me out of this!

https://support.mozilla.org/en-US/questions/1479231

Réitithe Cartlannaithe 2 203

Mozilla Firefox won't open

When I try and open Firefox, a window pops up for a millisecond before going off my screen, and firefox doesnt open. This is extremely irritating as i downloaded firefox … (tuilleadh eolais)

When I try and open Firefox, a window pops up for a millisecond before going off my screen, and firefox doesnt open. This is extremely irritating as i downloaded firefox since I also cant open chrome. Is there a fix to this, I have restarted my computer and have uninstalled and reinstalled firefox.

Thanks, Nathan

Réitithe Cartlannaithe 5 297

Firefox not opening

Hello! I am an avid user of firefox (especially with adblockers) on a windows 11 PC. Unfortunately, I have recently been experiencing an issue where when I attempt to ope… (tuilleadh eolais)

Hello! I am an avid user of firefox (especially with adblockers) on a windows 11 PC. Unfortunately, I have recently been experiencing an issue where when I attempt to open firefox, a window will open for a split second before instantly closing again. My PC is up to date, I have tried refreshing firefox and doing a clean install, but cannot seem to overcome the issue, or even open it in safe mode. Does anyone have any advice? Many thanks in advance!

Réitithe Cartlannaithe 8 92

Mozilla Firefox

Mozilla Firefox is very slow and even difficult to open.....I am using this browser since ten years and never had any problem....Please do the needful at your earliest...… (tuilleadh eolais)

Mozilla Firefox is very slow and even difficult to open.....I am using this browser since ten years and never had any problem....Please do the needful at your earliest...Thank a lot....RASIK MER

Faoi Ghlas 1 55

Launching Firefox

I launch Firefox from a shortcut in the QuickLaunch bar. I need to double-click that to get a response. But then TWO instances of Firefox open, and I have to close one - … (tuilleadh eolais)

I launch Firefox from a shortcut in the QuickLaunch bar. I need to double-click that to get a response. But then TWO instances of Firefox open, and I have to close one - which seems a waste of time and effort over and over and over. My system is x32Win10ProV22H2. How to get just one instance ?

Réitithe Cartlannaithe 1 79

Firefox crashing immediately after install, won't open

I'm trying to install Firefox on my work computer (ARM64 version), but when I do I'm getting the crash report window at the end of the installation process (multiple time… (tuilleadh eolais)

I'm trying to install Firefox on my work computer (ARM64 version), but when I do I'm getting the crash report window at the end of the installation process (multiple times in a row), if I try to open the browser (only once), and during the uninstallation process (also multiple times in a row). I've tried a clean reinstall multiple times, including deleting the folders from program files, %APPDATA%, and all registry entries I could find (HKEY_CURRENT_USER>>SOFTWARE, HKEY_LOCAL_MACHINE>>SOFTWARE, HKEY_LOCAL_MACHINE>>SOFTWARE>>WOW6432Node).

I've contacted IT and they don't seem to think anything pre-installed should be affecting this. I'm unable to get a crash ID as I'm unable to even start the browser - all I get is the Firefox crash reporter, immediately. Is someone able to help me figure out why I can't get this working?

Réitithe Cartlannaithe 4 325

Firefox opens infinite crash dialogue boxes and explodes my CPU

When I try to open Firefox it opens hundreds of crash reporter dialogue boxes and makes my computer slow to a halt, only restarting my computer can stop the onslaught. Re… (tuilleadh eolais)

When I try to open Firefox it opens hundreds of crash reporter dialogue boxes and makes my computer slow to a halt, only restarting my computer can stop the onslaught. Resolving a dialogue/close all doesn't help.

I've tried holding shift to start in troubleshoot mode, but it just opens the crash boxes rather than the 'do you want to start in troubleshoot' box.

I've run a scan with Malwarebytes, no hits, and Windows says there's no updates for me. I can't see any specific crash number, the 'submit' file in my Crash Reports folder says this:

[WARN crashreporter::net::ping] not sending legacy crash ping because no ping directory configured [WARN crashreporter::logic] not updating the events file; no events directory configured [ERROR crashreporter::net::http] background task error: process failed (exit status exit code: 1073807364) with [ERROR crashreporter::net::http] background task error: process failed (exit status exit code: 1073807364) with stderr: stderr: er::glean::uploader] failed to send glean ping: process fail[ERROR crashreporter::glean::[ERROR crashreporter::net::http] background task error: process failed (exit status exit code: 1073807364) with stderr: upload] Recoverable upload failure while attempting to send ping 9746c2ff-0e8b-47b5-bc82-3a14fbf8a[ERROR crashreporter::net::http] background task error: process failed (exit status exit code: 1073807364) with stderr:

-- 0

[WARN glean_core::upload] Recoverable upload failure while attempting to send ping 7be8924c-9a93-4169-8ff3-c29b26b5f75c, will retry. Error was RecoverableFailure { unused: 0 } [WARN glean_core::upload::directory] Cannot find ping file to process 7be8924c-9a93-4169-8ff3-c29b26b5f75c

                                                                                                                                                                                                                                                         [ERROR crashreporter::net::http] background task error: process failed (exit status exit code: 0xc000026b) with stderr:

And here is what I get when I click 'details' on the crash reporter:

BuildID: 20250717180000 CrashTime: 1753234799 InstallTime: 1753232273 ModuleSignatureInfo: {"Microsoft Windows":["bcryptPrimitives.dll","wininet.dll","urlmon.dll","srvcli.dll","iertutil.dll","ktmw32.dll","version.dll","wsock32.dll","propsys.dll","uxtheme.dll","kernel.appcore.dll","windows.storage.dll","ntmarta.dll","netutils.dll","CRYPTBASE.dll","wldp.dll","ntasn1.dll","ncrypt.dll","msasn1.dll","sspicli.dll","profapi.dll","wintrust.dll","ucrtbase.dll","gdi32full.dll","bcrypt.dll","KERNELBASE.dll","crypt32.dll","msvcp_win.dll","win32u.dll","sechost.dll","imagehlp.dll","gdi32.dll","shlwapi.dll","ws2_32.dll","oleaut32.dll","SHCore.dll","advapi32.dll","psapi.dll","imm32.dll","msvcrt.dll","shell32.dll","kernel32.dll","combase.dll","ole32.dll","user32.dll","rpcrt4.dll","ntdll.dll","kbdus.dll"],"Mozilla Corporation":["firefox.exe","gkcodecs.dll","nss3.dll","mozglue.dll","lgpllibs.dll"],"Malwarebytes Inc":["mbae64.dll"],"Microsoft Windows Software Compatibility Publisher":["msvcp140.dll","VCRUNTIME140.dll","VCRUNTIME140_1.dll"]} ProductID: {ec8030f7-c20a-464f-9b0e-13a3a9e97384} ProductName: Firefox ReleaseChannel: release StartupTime: 1753234797 SubmittedFrom: Client Throttleable: 1 UptimeTS: 2.0 Vendor: Mozilla Version: 141.0 WindowsErrorReporting: 1 This report also contains technical information about the state of the application when it crashed.ii

Réitithe Cartlannaithe 1 205

Can't launch firefox stable after launching firefox nightly.

I have this message after returning from nightly version to the stable one: ``` Using an older version of Firefox can corrupt bookmarks and browsing history already saved… (tuilleadh eolais)

I have this message after returning from nightly version to the stable one: ``` Using an older version of Firefox can corrupt bookmarks and browsing history already saved to an existing Firefox profile. To protect your information, create a new profile for this installation of Firefox. ```

Faoi Ghlas Cartlannaithe 1 262

Firefox crashing on startup. Crash reporter immediately appears.

My Surface Laptop 7 w/ SnapDragon Elite's Firefox installation started crashing this morning immediately after rebooting to complete some Windows updates. I have attempt… (tuilleadh eolais)

My Surface Laptop 7 w/ SnapDragon Elite's Firefox installation started crashing this morning immediately after rebooting to complete some Windows updates. I have attempted starting Firefox in Maintenance mode, Uninstalled and reinstalled and I still get the crash reporter. Refreshing Firefox at the uninstall process does not fix it.

I'm running Windows 11 Enterprise edition, fully patched w/ Firefox 146.0.

The 4 Windows updates that were installed:

Uninstalled KB5072033 Uninstalled KB5070311 Cannot be uninstalled KB5072641 Cannot be uninstalled KB5071142

Still didn't fix the problem.

These are the recent crash reports:

Crash ID: bp-8ec5b63c-4408-437c-b9bb-f4d5b0251213 Crash ID: bp-ce396463-0a75-46b6-8131-33cce0251213 Crash ID: bp-ea0b59dd-1cee-48da-957e-949120251213 Crash ID: bp-f9342e01-1a55-4387-af6d-3b8ef0251213

Any help is appreciated!

Réitithe 3 656

When opening Firefox version 147 "Error: Platform version '147.03' is not compatible with minversion >=147.02 maxversion <=147.02. Maybe try to reinstall Firefox?" The browser will not open.

When opening Firefox version 147 it asked if I wanted to install updates and after answering affirmative, then it gave "Error: Platform version '147.03' is not compatible… (tuilleadh eolais)

When opening Firefox version 147 it asked if I wanted to install updates and after answering affirmative, then it gave "Error: Platform version '147.03' is not compatible with minversion >=147.02 maxversion <=147.02. Maybe try to reinstall Firefox?" The browser will not open. What is the workaround??

Réitithe 2 96

FireFox crashes on startup - even in safe mode - with reportID inside

- Had 3 windows open with numerous tabs and tab groups - Firefox sync was enabled, as well as a 2-3 plugins AFAIK - Version installed is latest as of this writing 139.0.4… (tuilleadh eolais)

- Had 3 windows open with numerous tabs and tab groups - Firefox sync was enabled, as well as a 2-3 plugins AFAIK - Version installed is latest as of this writing 139.0.4 - Initial crash caused by opening and quickly closing (IF that succeeded before crash) a onedrive share link - Cannot start firefox any more, also not in safe mode - the only thing that works is launching it with a fresh profile.

The report ID is bp-a8c824fc-a7fb-4290-a72b-b63160250620

Ideally I can resolve this without needing to refresh or start over with a new profile

Réitithe Cartlannaithe 1 125

Cannot Launch Firefox Because Profile Can't Load

Hi, I am using OS MX-25 Linux and after importing my previous FF profile from an earlier version of MX everything in Firefox 145.0 was fine: my bookmarks and extensions a… (tuilleadh eolais)

Hi,

I am using OS MX-25 Linux and after importing my previous FF profile from an earlier version of MX everything in Firefox 145.0 was fine: my bookmarks and extensions all loaded and everything was tickety-boo. However, after I attempted to relaunch FF I got the following message:

Your Firefox profile cannot be loaded. It may be missing or inaccessible.

I have tried numerous times to launch FF but just keep getting this message.

Eventually it launched, but after a while pages refused to load properly and so I closed it down. Since then, I have been unable to get FF to open.

Any help would be greatly appreciated.

Réitithe 3 125

UNABLE to access the Firefox web browser

After the latest version was updated, Version 149.00.7, on my laptop, on 27 March 2026, the browser closed midway while I was working, and now I can no longer access Fir… (tuilleadh eolais)

After the latest version was updated, Version 149.00.7, on my laptop, on 27 March 2026, the browser closed midway while I was working, and now I can no longer access Firefox.

When I click on the Icon to access I keep getting the following error message as per the attachment:

I have uninstalled Firefox and re-installed it THREE TIMES already', but I still get the same error as before, as per the screen print provided.

I have even tried to install Firefox with custom settings, but then in order to proceed with the installation the ONLY button to proceed was the "UPGRADE" option.

I am at my wits end because this is totally unacceptable and the updated version obviously DOES NOT WORK!!!

Your urgent attention and prompt action in sorting this out will be appreciated, thanks.

Hettie

Réitithe 3 58

No icon FireFox on desktop. How access?

Actually this is just the only route I could figure out to your page where I had PREVIOUSLY asked this question and was checking back in to see whether 'the Community' ha… (tuilleadh eolais)

Actually this is just the only route I could figure out to your page where I had PREVIOUSLY asked this question and was checking back in to see whether 'the Community' had given me an answer yet. I'm no doubt IMPATIENT since my bank told me I need you, not Google and Microsoft Edge , who I both HATE for coming on to MY laptop, asking for more information sharing and basically DEMANDING I follow their marketing instructions since they had somehow REMOVED the X at the top right corner and simultaneously BLOCKED my access to and use of my OWN laptop, so that each time I have NO OPTION but to turn off the power on my laptop, to "reboot" as they once said. If even a basic, ancient telephone can be HUNG UP on scammers.....forgive me. I REALLY want to use your search engine, as WELL as your site. Please advise.

Faoi Ghlas 1 143

Firefox will not open in Windows 11

Firefox has been working fine, but today when I clicked to start, I received an error message. "The file or directory is corrupted or unreadable." When trying to uninstal… (tuilleadh eolais)

Firefox has been working fine, but today when I clicked to start, I received an error message. "The file or directory is corrupted or unreadable." When trying to uninstall Firefox, Windows cannot find the uninstall helper. When I try to download a new version, I receive an error message: "Couldn't download - virus scan failed." Windows Security reports are all good. A scan found no viruses. Firefox will not open at all.

Réitithe Cartlannaithe 2 282

Unable to Launch Firefox 3.5.19 On Linux Ubuntu 24.04.2 LTS

Can’t launch Firefox 3.5.19 on Linux Ubuntu When trying to run with: ./firefox Terminal gives the following: ./firefox-bin: error while loading shared libraries: libdbus-… (tuilleadh eolais)

Can’t launch Firefox 3.5.19 on Linux Ubuntu When trying to run with:

./firefox

Terminal gives the following:

./firefox-bin: error while loading shared libraries: libdbus-glib-1.so.2: cannot open shared object file: No such file or directory

Réitithe Cartlannaithe 8 530