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32-bit works, 64-bit does not

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I was having Firefox (slow) performance issues and decided to re-install. After re-installation, firefox would not start (could see the process firing but closing immeadiatey, the app didnt even open). Upon advice received here (, installed an earlier version (54) of firefox which started. Then I did all the updates to recent versions and it kept working. Only then I realized I had just installed the 32-bit version. As I try to use the same procedure to install the 64-bit version, I am back to the same problem (firefox not starting). Now I found that I can get firefox to start by renaming the firefox.exe to something else (e.g. firefox1.exe). It does start but it seems the intial performance problems persist. Additionally, it keeps asking me if I want to make Firefox my default browser. I keep answering yes to no effect as every time I start firefox it asks me the same thing. If I try to make Firefox my default browser through windows settings (or control panel) firefox is not listed by windows as an installed application. In short, I cannot get the 64-bit installation being recognized by windows (windows 10 home) and without renaming the exe file. In addition It seems to perform poorly.

I have also checked for malware, nothing detected.

I was having Firefox (slow) performance issues and decided to re-install. After re-installation, firefox would not start (could see the process firing but closing immeadiatey, the app didnt even open). Upon advice received here (, installed an earlier version (54) of firefox which started. Then I did all the updates to recent versions and it kept working. Only then I realized I had just installed the 32-bit version. As I try to use the same procedure to install the 64-bit version, I am back to the same problem (firefox not starting). Now I found that I can get firefox to start by renaming the firefox.exe to something else (e.g. firefox1.exe). It does start but it seems the intial performance problems persist. Additionally, it keeps asking me if I want to make Firefox my default browser. I keep answering yes to no effect as every time I start firefox it asks me the same thing. If I try to make Firefox my default browser through windows settings (or control panel) firefox is not listed by windows as an installed application. In short, I cannot get the 64-bit installation being recognized by windows (windows 10 home) and without renaming the exe file. In addition It seems to perform poorly. I have also checked for malware, nothing detected.

Question owner

Below is my previous question which led me to the first work around. https://support.mozilla.org/en-US/questions/1173413

Below is my previous question which led me to the first work around. https://support.mozilla.org/en-US/questions/1173413
FredMcD
  • Top 10 Contributor
4256 solutions 59604 answers

Others have reported problems with 64-bite while 32 has no problem.

Others have reported problems with 64-bite while 32 has no problem.
Allan2 0 solutions 6 answers

I just posted on the old thread here https://support.mozilla.org/en-US/questions/1173413, before I found this thread, but in summary I can confirm that I too am having this problem on one PC. I'm convinced that this is something in the registry, but cannot locate the issue... Very frustrating :(

PS: Windows 10 Pro

I just posted on the old thread here https://support.mozilla.org/en-US/questions/1173413, before I found this thread, but in summary I can confirm that I too am having this problem on one PC. I'm convinced that this is something in the registry, but cannot locate the issue... Very frustrating :( PS: Windows 10 Pro

Modified by Allan2

Question owner

Allan2, the only way I managed to keep using firefox is installing an older 32bit as described and let it update to latest 32bit version. 64bit is a complete no-go for me and since I cannot seem to get an answer on how to actually fix the issue, 32bit will be until a fresh windows installation or until i get fed up and move to another browser.

Good luck!

PS. well, now that recent update to 56.0.1 is to migrate 32bit user to 64bit, I am guessing my home computer will not be able to run firefox anymore. Will update this thread when I have updated but I suspect its time to look for another browser.

Allan2, the only way I managed to keep using firefox is installing an older 32bit as described and let it update to latest 32bit version. 64bit is a complete no-go for me and since I cannot seem to get an answer on how to actually fix the issue, 32bit will be until a fresh windows installation or until i get fed up and move to another browser. Good luck! PS. well, now that recent update to 56.0.1 is to migrate 32bit user to 64bit, I am guessing my home computer will not be able to run firefox anymore. Will update this thread when I have updated but I suspect its time to look for another browser.

Modified by rpaulino

Question owner

As expected, upon update and migration to 64bit version, firefox is again not starting. Unless I can get a real answer to this I am quitting Firefox.

As expected, upon update and migration to 64bit version, firefox is again not starting. Unless I can get a real answer to this I am quitting Firefox.
Allan2 0 solutions 6 answers

Hi rpaulino, I suspect that something in the upgrade process caused some key in the registry to be corrupted - one that is not removed by the uninstall software or Ccleaner once FF is uninstalled.

I suspect that only a complete refresh of Win 10 might resolve the issue, but that is a drastic approach with the need to reinstall applications. If that failed, then a reinstall from the ISO for Win 10 would almost certainly work.

Perhaps, if we're lucky, the new Win 10 update might clean it out - but I suspect not.

I'm afraid that for now, I've given up on FF for that computer and gone back to using Edge (which is not as bad as some make out). Pity really as I do prefer FF.

Surely one of the developers at Mozilla could suggest some registry keys to check. Anyone?

Hi rpaulino, I suspect that something in the upgrade process caused some key in the registry to be corrupted - one that is not removed by the uninstall software or Ccleaner once FF is uninstalled. I suspect that only a complete refresh of Win 10 might resolve the issue, but that is a drastic approach with the need to reinstall applications. If that failed, then a reinstall from the ISO for Win 10 would almost certainly work. Perhaps, if we're lucky, the new Win 10 update might clean it out - but I suspect not. I'm afraid that for now, I've given up on FF for that computer and gone back to using Edge (which is not as bad as some make out). Pity really as I do prefer FF. Surely one of the developers at Mozilla could suggest some registry keys to check. Anyone?
guigs 1072 solutions 11697 answers

First, I am sorry to hear that the only work around in this thread are renaming the firefox.exe file or downgrading, this is not an ideal situation. You need to also make sure you have 64-bit version of Windows 7 or higher. Firefox 64bit will not run on 32bit version of windows. So if we are going to use an ISO, please make sure it is the 64bit version of Windows.

I don't think we have to go as far as an ISO re-install, unless that is the case that you have Windows 7 32bit.

After you have updated to the Windows 64bit version, please start Firefox with the profile mananger to manage your profiles.

  1. Open cmd.exe
  2. Paste "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -P
  3. Then hit enter
  4. Does Firefox start? Choose the profile, that includes 'defualt' if you recieve an error, create a new one.

Then follow the instructions on how to move over the profile info into a new profile - Profile Manager - Create, remove, or switch Firefox profiles

If Firefox does not start, please let me know. We can also get a new stub installer - with these instructions

First, I am sorry to hear that the only work around in this thread are renaming the firefox.exe file or downgrading, this is not an ideal situation. You need to also make sure you have 64-bit version of Windows 7 or higher. Firefox 64bit will not run on 32bit version of windows. So if we are going to use an ISO, please make sure it is the 64bit version of Windows. I don't think we have to go as far as an ISO re-install, unless that is the case that you have Windows 7 32bit. After you have updated to the Windows 64bit version, please start Firefox with the profile mananger to manage your profiles. #Open cmd.exe # Paste "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -P #Then hit enter #Does Firefox start? Choose the profile, that includes 'defualt' if you recieve an error, create a new one. Then follow the instructions on how to move over the profile info into a new profile - [[Use the Profile Manager to create and remove Firefox profiles]] If Firefox does not start, please let me know. We can also get a new stub installer - [https://mzl.la/296nK2i with these instructions]
Allan2 0 solutions 6 answers

Thanks guigs for taking the time to respond. I had tried all of the fault finding techniques including the one you outlined above. Firefox will not run even with the -P option.

Besides, I completely removed it, including all directories related to Firefox both in Program directories and Data directories and then reinstalled it from scratch. Even that did not work.

Even an install of an earlier version did not work.

To be clear this is on a 64Bit Windows 10 PC. I gave up on that PC.

Thanks guigs for taking the time to respond. I had tried all of the fault finding techniques including the one you outlined above. Firefox will not run even with the -P option. Besides, I completely removed it, including all directories related to Firefox both in Program directories and Data directories and then reinstalled it from scratch. Even that did not work. Even an install of an earlier version did not work. To be clear this is on a 64Bit Windows 10 PC. I gave up on that PC.

Modified by Allan2

guigs 1072 solutions 11697 answers

In that case I would use CCleaner to clean up any corrupt registries and start from a new official install. How to download and install Firefox on Windows

In that case I would use CCleaner to clean up any corrupt registries and start from a new official install. [[How to download and install Firefox on Windows]]
Allan2 0 solutions 6 answers

Thanks but I tried that and yes CCleaner removed quite a few Mozilla entries. Interestingly the registry still has a few when I do a manual search in Regedit, but MS also seem to put certain entries there for Mozilla and Symantec and a whole heap of products even on a fresh Windows install so I don't dare touch those.

This one is a truly weird problem. I'm certain that something failed on the update and resulted in a corrupt registry entry somewhere, but given CCleaner does not remove it, I'm not sure how I could find it.

I've been using Chrome (wash my mouth out for saying that :) )

Thanks but I tried that and yes CCleaner removed quite a few Mozilla entries. Interestingly the registry still has a few when I do a manual search in Regedit, but MS also seem to put certain entries there for Mozilla and Symantec and a whole heap of products even on a fresh Windows install so I don't dare touch those. This one is a truly weird problem. I'm certain that something failed on the update and resulted in a corrupt registry entry somewhere, but given CCleaner does not remove it, I'm not sure how I could find it. I've been using Chrome (wash my mouth out for saying that :) )
cor-el
  • Top 10 Contributor
  • Moderator
17531 solutions 158524 answers

This can also happen if you have software that hooks into Firefox that isn't compatible with 64-bit Firefox. You can check the Windows Event log to see if there are details about these failures.

This can also happen if you have software that hooks into Firefox that isn't compatible with 64-bit Firefox. You can check the Windows Event log to see if there are details about these failures.
Allan2 0 solutions 6 answers

Yeah its now been several weeks since I was trying to work through all this, but I did check the event logs at the time. I remember there was an error with the Faulting Application path being c:\....\ Firefox.exe and the faulting module of ntdll.dll.

A Scannow and DISM report did not show any Windows problems, so...

I don't think the problem is Firefox per se. But neither does it appear to be a Windows problem. It is weird that all was fine until the update of Firefox, but...

I really think the only way out of this will be a complete rebuild of Win 10 on this machine and a fresh install. Until I have time to do that (probably in January), I don't think I'm going to get anywhere with this one and have given up.

I appreciate people's efforts.

Yeah its now been several weeks since I was trying to work through all this, but I did check the event logs at the time. I remember there was an error with the Faulting Application path being c:\....\ Firefox.exe and the faulting module of ntdll.dll. A Scannow and DISM report did not show any Windows problems, so... I don't think the problem is Firefox per se. But neither does it appear to be a Windows problem. It is weird that all was fine until the update of Firefox, but... I really think the only way out of this will be a complete rebuild of Win 10 on this machine and a fresh install. Until I have time to do that (probably in January), I don't think I'm going to get anywhere with this one and have given up. I appreciate people's efforts.