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Firefox 49 won't start after installation

OS : Windows 7 x64 I was using Firefox 48.0.2 (x64) - french version. I manually downloaded and installed Firefox 49.0 (x64). After installation, Firefox does not start :… (ulteriori informazioni)

OS : Windows 7 x64 I was using Firefox 48.0.2 (x64) - french version. I manually downloaded and installed Firefox 49.0 (x64). After installation, Firefox does not start : - the firefox.exe process is running, using something between 5000 and 65000 Mb of memory - nothing else happens : the process does nothing, using 0% CPU

I've seen this issue : - on several PC's of my organization - after automatic update or manual update - after having deleted my Firefox profile - after having disabled Kasperky Antivirus

I've noticed that the last version of Firefox Developer Edition has the same behaviour : install OK, won't start.

Going back to previous version is OK : Firefox starts again.

Chiesto da assistance-multi 4 anni fa

Ultima risposta by Truckerman 4 anni fa

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firefox version 48 is the latest that will run, after update to higher versions it will no longer run on win10

About a week ago I could no longer open firefox (my standard browser) I could not find what causes the problem. Firefox would appear in 'task manager' but not on the scre… (ulteriori informazioni)

About a week ago I could no longer open firefox (my standard browser)

I could not find what causes the problem. Firefox would appear in 'task manager' but not on the screen to start using it.

I came across an old version of firefox in my downloads and installed this.

I now have found out that the latest working version for me is 48.0.2. I also tried the nightly version 52 but it didn't work neither. Currently I am running 48.0.2 after the auto-update I will no longer be able to use firefox and will have to reinstall 48.0.2

I am using a desktop version of Windows 10 Pro / 64-bit / Dutch version On: i5-4670 cpu @ 3.4Ghz / 8Gb RAM

Chiesto da beedeew 4 anni fa

Risposta di beedeew 4 anni fa

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Browser 49.0.1 will not show up on my computer running XP SP3.

I am running XP SP3 and Firefox just updated to 49.0.1 and suddenly....NO Firefox! I can see that the program is running in the Task Manager Processes but the application… (ulteriori informazioni)

I am running XP SP3 and Firefox just updated to 49.0.1 and suddenly....NO Firefox!

I can see that the program is running in the Task Manager Processes but the application does not run on my computer. If I try to load it again, another instance will show up in task manager processes - each time it is about 48,000K.

I have tried:

shutting down/restarting ending process/process tree

And I have tried all steps for a clean install with and without uninstalling the application:

-uninstall in the add/remove utility (will not uninstall) -deleting installation directory (will not delete, says it is in use by another person or program) -deleting temporary Firefox data (I could accomplish that) -deleting Windows Firefox prefetch (I could also accomplish that) -re-installing 49.0.1 (yes I can install, but to no avail)

I also tried an online tech support that tried to fix things in safe mode. Futile, and then the computer got stuck in safe mode and would not boot into normal. The computer had to be set for a week ago, which gave me Firefox back at version 48. But even that would not open because of something about XPCOM (sorry I am unable to remember the exact error message).

After that I once more uninstalled and re-installed 49.0.1. It's in my programs. But still nothing. I'm exhausted.

Do I just give up on Firefox? Any other possibilities?

Thanks to anyone who might be able to work with me on this.

Chiesto da mhalpert 4 anni fa

Ultima risposta by philipp 4 anni fa

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Firefox window does not open, but it is on the task manager list

As the question says, Firefox does appear on the task manager as open but the window is not actually there. I tried reinstalling it, but it did not help. I also tried run… (ulteriori informazioni)

As the question says, Firefox does appear on the task manager as open but the window is not actually there. I tried reinstalling it, but it did not help. I also tried running as administrator and in the safe mode - still nothig. I know it did work earlier, then it began to open very slowly and now the window doesn't appear at all. I don't use this computer, my mom does, so I don't know any more details. The system is windows 10 upgraded from windows 8. Hope someone could help me with this.

Chiesto da Flameborg 4 anni fa

Ultima risposta by philipp 4 anni fa

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firefox wont start after update win10

Received a notification to restart firefox to apply an update, clicked on restart, it did the upgrade process, the window closed but firefox did not start. I could see fi… (ulteriori informazioni)

Received a notification to restart firefox to apply an update, clicked on restart, it did the upgrade process, the window closed but firefox did not start. I could see firefox.exe process running in my task manager. i restarted my system, tried uninstalling and reinstalling different versions. deleted appdata/mozilla, disabled my security software (kaspersky antivirus) but nothing helped. I see the process running in task manager and Profile manager and safe mode do the same thing as well. I am not sure if this has any relevance, but i did install a "big" windows 10 update on friday. but everything worked great untill i clicked restart firefox. any help will be appreciated.

Chiesto da asifbalgar 4 anni fa

Risposta di philipp 4 anni fa

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Firefox will not load, even in safe mode

This evening, Mozilla FIrefox stopped working on my PC (windows 7, 64 bit, Firefox 49.0.1) When I start it, there's a 32k process running firefox.exe, but no window opens… (ulteriori informazioni)

This evening, Mozilla FIrefox stopped working on my PC (windows 7, 64 bit, Firefox 49.0.1)

When I start it, there's a 32k process running firefox.exe, but no window opens.

I have uninstalled firefox, deleted the profile folder, registry settings and everything, reinstalled and it still won't run. I have tried turning off Kaspersky and trying safe mode and the results are the same.

I scanned with MalwareBytes and nothing is reported.

The only way firefox starts is if I start windows in safe mode. Any ideas?

Chiesto da brendanlo 4 anni fa

Ultima risposta by philipp 4 anni fa

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Firefox won't start after update 49.0

Hello, dear friends. Browser updated itself to version 49.0. However, Firefox restarts and nothing happens. There is a Firefox.exe running in system processes. But there … (ulteriori informazioni)

Hello, dear friends. Browser updated itself to version 49.0. However, Firefox restarts and nothing happens. There is a Firefox.exe running in system processes. But there are no any error messages nor a Firefox's window. I've checked Crash reports folder. But there are no new files dated this month. I've launched Firefox in safe mode via Windows key + R -> firefox -safe-mode - still the same issue. Turned off my AV and any other soft, restarted PC many times and so on. Moreover, I've tried to install new Firefox in Sandboxie (sandbox utility) - also nothing happens. Firefox launched as a process and that's all. 10 mins, 30 mins - nothing. Could you be so kind and let me know if it's possible to fix this issue somehow, please? I've downgraded my FF to 48.0.2 and it works fine, but you know - it'd be nice to have an upgraded one. Thank you in advance.

Chiesto da leningrib 4 anni fa

Risposta di assistance-multi 4 anni fa

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Firefox on W7 starts but is "invisible": process runs but is unusable

I've used Firefox for years on my DELL Windows 7 laptop. After a recent, weekly reboot, it stopped working. By that, I mean that when I run it, a firefox.exe appears in t… (ulteriori informazioni)

I've used Firefox for years on my DELL Windows 7 laptop. After a recent, weekly reboot, it stopped working. By that, I mean that when I run it, a firefox.exe appears in the task manager but I can't "connect" to it. On the task manager I can see that it is using Memory and has a value for both I/O read Bytes and I/O Write Bytes (albeit these do not change after Firefox has started)

I've tried the following

Removed Firefox from the control panel & reinstalled

Renamed firefox directories ("C:\Program Files (x86)\Mozilla Firefox" & C:\Program Files (x86)\Mozilla Maintenance Service), rebooted and reinstalled

Looked in these forums and have tried solutions to problems that sound VERY similar to mine (e.g. https://support.mozilla.org/en-US/questions/1128956)

Did a virus scan

Ran a Malware bytes scan

Reinstalled java

Tried to run Firefox in Safe Mode (hold down SHIFT and double click on icon)

Run Firefox from the command line with various options - e.g. "firefox /safe"

Tried installing both the 64bit (as used originally) and 32bit versions

Fiddled around with profiles in C:\Users\USERNAME\AppData\Local\Mozilla\Firefox\Profiles as per various recommendations in these forums


But none of these work. Afterwards, Firefox just appears in the Task Manager (but NOT the Task Bar) and does nothing.

The only thing that does work is if I reboot my laptop into Windows Safe Mode (with networking). This allows Firefox to work but there is nothing obvious wrong with anything, so I don't know what to fix. I tried switching off Hardware acceleration in Firefox options but this made no difference once I did a normal reboot of the laptop.

My Laptop has an up to date W7 OS and all both Chrome and IE browsers work fine - as does everything else. Firefox is the only problem and then only since Monday - it has worked fine for many years up to Friday. No changes were made on the day the Laptop was restarted, no new programs installed, nothing. A colleague has a similar setup (company-dictated config on W7 laptop, same OS, Virus scanner, etc) and has no problems.

At this point I've done many reboots, reinstalls, searching for solutions but nothing works. What is interesting is that I'm not the only person to have this exact problem (see link above) but so far a solution eludes me.

Any help very greatfully received - Please Help!

Chiesto da route66 4 anni fa

Risposta di assistance-multi 4 anni fa

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Firefox stopped launching. Uninstalled & reinstalled. Went normally but Firefox still won't launch. The firefox process comes up. help

FF 49.0.1, Window 7, 32-bit, Dell Latitude laptop. Firefox stopped launching, i.e. opening the UI. Fails to appear in the Task Manager "Applications" tab. Does appea… (ulteriori informazioni)

FF 49.0.1, Window 7, 32-bit, Dell Latitude laptop. Firefox stopped launching, i.e. opening the UI. Fails to appear in the Task Manager "Applications" tab. Does appear twice in the Task Manager "Processes" Tab. Two sizes 15576K and 3700K. I tried uninstalling, rebooting, and re-installing. The uninstall appeared to run successfully. The subsequent installation appeared to run correctly. All file folder have correct date/time stamps.

Perhaps there some residual file that needs to be removed in order for Firefox to initialize properly? If so, what/where is it?

HELP, please.

Chiesto da WTC71 4 anni fa

Risposta di asifbalgar 4 anni fa

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Firefox will not start anymore on Windows 10 Pro

Within the last few days, Firefox is ceasing to work on our Windows 10 Pro machines. Possibly after receiving the latest update to 49. Have uninstalled and re installed … (ulteriori informazioni)

Within the last few days, Firefox is ceasing to work on our Windows 10 Pro machines. Possibly after receiving the latest update to 49.

Have uninstalled and re installed with fresh download. No help

Chiesto da kaitlynnm 4 anni fa

Ultima risposta by philipp 4 anni fa

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I downloaded and installed Firefox but it won't open. It is running somewhere as I can see t in task manager, but no browser appears.

As stated above, FF just won't function. I have tried starting FF in safe mode but it still won't run any kind of browser or application, other than appearing in task man… (ulteriori informazioni)

As stated above, FF just won't function. I have tried starting FF in safe mode but it still won't run any kind of browser or application, other than appearing in task manager. I have uninstalled/reinstalled, rebooted, etc, but there's no change. I have a fairly new machine, running windows 10 and i7 core. Chrome and MS Edge are working fine. Help me pls!

Chiesto da pirran 4 anni fa

Ultima risposta by philipp 4 anni fa

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Firefox not opening or loading

My Firefox updated itself and wont start at all, which is odd as it was working fine before. I am using Window 8.1 64 bit version, when checking in the task manager there… (ulteriori informazioni)

My Firefox updated itself and wont start at all, which is odd as it was working fine before. I am using Window 8.1 64 bit version, when checking in the task manager there is a process running using 30mb and 0% cpu .

Stuff i tried so far:

- try loading it in safemode - still doesn't load
- tried deleting the profiles found under users/appdata
- tried uninstalling and downloading a fresh copy.
- tried disabling kaspersky and malwarebytes

any other suggestions?

thanks

Chiesto da firefoxmole 4 anni fa

Ultima risposta by philipp 4 anni fa

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FF49 does not open Window, but is running in Taskmgr. Issue?

Having the same issue as others posting to this site. Had older version of FF running for years until very recently. I have tried: 1. Updated to FF 49 2. Run several Vi… (ulteriori informazioni)

Having the same issue as others posting to this site. Had older version of FF running for years until very recently. I have tried:

1. Updated to FF 49 2. Run several Virus scanners as recommended in other articles on this site. Some PUP and Adware results found and quarantined. 3. Tried to recreate Profile, but Profile mgr does not run 4. Renamed xulstore.json and localstore.rdf, but did not help nor recreate these files.

I am unable to add the requested troubleshooting info as I cannot access Help

Any advice is appreciated

Chiesto da claible 4 anni fa

Ultima risposta by philipp 4 anni fa