Firefox is not running/starting although it is installed on my computer

suddenly now, when i click firefox icon it is not starting/running. it used to open before

See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
*https://support.mozilla.com/kb/Firefox+hangs

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When I try to open Firefox, I get a message saying that firefox is already currently running, although it is not running. Close and try again or restart computer. How can I fix this?

I always close Firefox when I am finished with the web. When I try to open it later, I often get a message saying that firefox is currently running, so close it first. As far as I can tell, firefox is not running. The message then says to restart your computer and try again. I restart my computer and then firefox opens.

https://support.mozilla.com/en-US/kb/Firefox%20hangs See '''hang-at-exit'''

Ran firefox update and now firefox does not run correctly.

I ran the latest firefox update 9Firefox Setup Stub 33.0). Now when I start firefox the browser opens and inside of it is black. I cannot see anything to use the browser. I have uninstalled and reinstalled with no luck. I have also restarted my computer. I have taken a screen shot of what it looks like.

Currently in version 33, Firefox has implemented a new, faster way of loading webpages. This new feature is called OMTC. However, there are still some tweaks Mozilla developers are making to this.
There is a known issue that Mozilla works on very hard to fix: if you are experiencing black webpages on some sites, here's what you can do to avoid the problem in the meantime:
If Firefox is open, you can restart in Firefox Safe Mode from the Help menu:
* Click the menu button [[Image:New Fx Menu]], click Help [[Image:Help-29]] and select ''Restart with Add-ons Disabled''.
If Firefox is not running, you can start Firefox in Safe Mode as follows:
* On Windows: Hold the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
When the Firefox Safe Mode window appears, select "Start in Safe Mode". 
[[Image:Safe Mode Fx 15 - Win]]
To disable Hardware Acceleration
* Click the menu button [[Image:New Fx Menu]] and select ''Options''.
* In the Firefox Options (or Preferences) window, click the ''Advanced'' tab, then select ''General''.
* In the settings list, you should find the ''Use hardware acceleration when available'' checkbox. Uncheck this checkbox.
Now, exit Firefox, wait a few seconds, and then start it normally.
Please let us know if this solves the problem. Engineering is also gathering more information about the issue would request that you fill out [http://www.surveygizmo.com/s3/1851506/1c87a6cf309a this survey]
I should also mention that other users with this problem had an embedded intel hd graphics card with an old driver present. Until Mozilla comes up with a fix, if you want Hardware Acceleration in Firefox, you can try to update your driver through the appropriate link below to see if that helps:
Intel HD 2000/3000:
32bit https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23763
64bit https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23764
Intel HD 4000:
32bit https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=24328
64bit https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=24329
Thank you!

After refomatting HDD, reinstalling Vista plus service packs, recovering files from Microsoft backup and installing new copy of Firefox 3.6, Firefox will not run. Have deleted all old M0zilla profile folders and reinstalled Firefox again to no avail.

After computer would not boot and could not be repaired, I reformatted the HDD, reinstalled Vista plus all service packs and updates, recovered files from Microsoft backup and installed new copy of Firefox 3.6. Firefox will not run.
I have deleted all old M0zilla profile folders and reinstalled Firefox again to no avail.
After intallation was completed, the automatic startup just placed a small box on the screen "Import wiz". This just sat there with no activity. After I closed this box, none of the Firefox start buttons would open the program -- just the blue rotating icon for about 2 seconds then nothing.

Hi,
Please try to rebuil the WMI repository.
For detailed information, please refer to the blog below,
http://blogs.technet.com/b/askperf/archive/2009/04/13/wmi-rebuilding-the-wmi-repository.aspx
If issue persists, due to sfc doesn't work, could you try to repair your system with the installation disk?
Best Regards.
Steven Lee
TechNet Community Support

Firefox will not run after System restore or running in compatibility mode for windows 98. How do I fix this? I already tried all other solutions on this site.

I was running Firefox fine just yesterday. I screwed up the registry a litle while removing an installed program completely, so I restored the system and everything appeared to work fine. I then decided to play an old video game, Return to Krondor, which was made back in 1998, so I ran the program with no other programs running in compatibility for windows 98. After finishing the game, I closed it and put the computer in hibernation mode. I come back today and firefox will not run at all. It is not running in the background and there are no programs running. There are no services running which could interfere with it. I think somehow Firefox may think I'm in compatibility mode still, but I have no idea.
I'm running windows Vista 32 - bit with an AMD 2.4ghz processor, 4gb ram on an Emachine computer. I have already tried system restore, restart, processes etc. Nothing works. I can still run Internet explorer and all other programs.

The person that I was assisting, has Windows 7 which has 64 bit system. Her browser was IE 10.
Was IE11 ever offered (or installed) via Windows Update?
Is her computer currently fully-patched at Windows Update?
Is Adobe Shockwave Player v12.1 (or higher) installed on her computer?
Is Adobe Flash Player v15.0.0.189 (or higher) installed on her computer?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Troubleshoot Shockwave Player installation for Windows
http://kb2.adobe.com/cps/403/kb403264.html
You will find support for Shockwave Player in this forum:
http://forums.adobe.com/community/webplayers/webplayers_shockwave
~Robear Dyer (PA Bear) MS MVP-Windows Client since 2002 Disclaimer: MS MVPs neither represent nor work for Microsoft

Firefox will not run on download

firefox will not run on my computer

Try Scan your PC:
*[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware Problems caused by malwares]
Case the problem persist try disable the McAfee only for test, because in Brazilian Forum other user had the same problem that yours and the problem was cause by McAfee

My firefox is not running- when i try to open it their appears.. "The exception unknown software exception (0xc0000417) occurred in the application at location

<blockquote>Locking duplicate thread. 
Please continue here: [[/questions/942433]]</blockquote>
my firefox is not running… when i try to open it their appears.. “The exception unknown software exception (0xc0000417) occurred in the application at location 0x78b2ae6e” ..what can i do..????
REPLY

If you have submitted crash reports then please post the IDs of one or more crash reports that have this format:
*bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
See:
*http://kb.mozillazine.org/Mozilla_Crash_Reporter
*https://support.mozilla.org/kb/Mozilla+Crash+Reporter
If you can't open Firefox then see:
*http://kb.mozillazine.org/Mozilla_Crash_Reporter#Location_of_crash_reports
*http://kb.mozillazine.org/Mozilla_Crash_Reporter#Viewing_crash_reports
See also:
*http://kb.mozillazine.org/Firefox_crashes
*https://support.mozilla.org/kb/Firefox+crashes
Try a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.
*C:\Program Files\Mozilla Firefox\
*http://kb.mozillazine.org/Installation_directory
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 17.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other profile data are stored in the Firefox Profile Folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

I am now using v3.68 and tried updating to v7.01 but it does not seem to work. Went to control panel to remove all the old versions but Firefox was not listed there although Thunderbird is there. Please advise asap, thanks

I am now using v3.6.8 and tried updating to v7.01 but it does not seem to work. Went to control panel to remove all the old versions but Firefox was not listed there although Thunderbird is there. Please advise asap, thanks

I recommend backing up your Firefox settings in case something goes wrong during the uninstall/reinstall process. See [https://support.mozilla.com/en-US/kb/Backing+up+your+information Backing up your information]. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)
In the Control Panel, Add/Remove programs, look for '''Mozilla Firefox'''. Make sure to save (do not delete) your personal settings when uninstalling.
If it isn't there, just try installing 3.6.23, which is the latest in the 3.6 family. You can download 3.6.23 here: http://www.mozilla.com/firefox/all-older
With respect to version 7.0.1, are you saying that the installation failed, or it seemed to work but it's nowhere to be found?

Will firefox for mobile run all my apps already installed?

Will Firefox for mobile run all my apps already installed? I would like to install Firefox on both my phone and on my tablet. They are both listed as being compatible with Firefox. However I don't want to lose use of the android apps I have paid for...

Thank you, I will install Firefox on my phone & tablet computer.

(solved)-Windows update cannot currently check for updates, because the service is not running. You may need to restart your computer

(solved)-Windows update cannot currently check for updates, because the service is not running. You may need to restart your computer
Hetti Arachchige V Aravinda | Network Administrator (B.Sc, MCP, MCTS, MCSA, MCSE, MCITP, CCNA, CEH, MBCS)| http://www.windowstechinfo.com |

Hi,
Glad to see your problem resolved, Hope your experience is helpful with others.
Roger Lu
TechNet Community Support

Firefox will not run - double click on icon, select icon and run/open, opening via start menu are all dead

Problem started yesterday (9/28). While in Firefox, bookmarks stopped working. Closed out FF and tried to reopen the program, and nothing causes FF to launch. Tried double clicking on the desktop icon, single click on the bottom status bar (on XP), right click on icon to open or run, trying via Start -> All Programs -> Mozilla and neither regular or safe mode would launch. Only thing that seems to fix the problem is a full restart of the computer. Tried downloading the newest version via Chrome. When I clicked to run the install, kept getting a message to close all FF windows, even though there were no FF windows open.

Check that you do not run Firefox as Administrator.
Right-click the Firefox desktop shortcut and choose "Properties". 
Make sure that all items are deselected in the "Compatibility" tab of the Properties window.
* Privilege Level: "Run this program as Administrator" should not be selected
* "Run this program in compatibility mode for:" should not be selected
Also check the Properties of the firefox.exe program in the Firefox program directory.
A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
* https://support.mozilla.com/kb/Server+not+found
* https://support.mozilla.com/kb/Firewalls

When I try to open firefox, I get a message that says, "firefox is already running" and to close it or restart my computer when it is NOT running, so I can't get on the internet through firefox. What is wrong?

The information box pops up when I click on my desktop icon for firefox as well as if I try to access it in other ways. I have restarted my computer. I have tried removing firefox and redownloading it. No matter what I do, it still gives me a box saying it is already running, but not responding. When I pull up my taks bar, it is not running! I can't close it as the box suggests because it is not open to do it. I just keep getting a box saying it is already running no matter what I try to do, even though it is not running.

I have tried everything I could to fix this, but some things require actually being on Firefox, and since I cannot get on, I cannot click on the tabs to do it. I have even totally uninstalled firefox, and that has not fixed this. I still get the same message that firefox is running and I need to close it or restart (which I have also tried dozens of times). I have removed things like Java, and that has not helped either. If I cannot even get on line in firefox, how can I fix this. I am not crazy about using internet explorer, but right now, it is my only option. I even tried to start in safe mode, and the same message box pops up!

Firefox will not re-start without "ending process" with Windows Vista Task Manager.

Error Message:
“Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.”
Have to start Task Manager and then end firefox.exe process.
Thanks all.

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Did this fix your problems? Please report back to us!

Firefox does not run smooth while loading websites.

Firefox does not work smoothly when it is loading any webpage. Specially, when I open new tabs and load new websites while it is still loading last website in other tab, the situation becomes worse. Main problems that occur are - page will not scroll, or scrolling hangs for a sec or so, works a little bit and it happens repeatedly, new tabs will open but not smoothly, website loading also gets affected in similar way. The dot that revolves on tabs while loading any webpage gets really annoying. It revolves intermittently. Imagine a car engine not starting, it starts, stops, starts, stops. That's what happens with Firefox. But once all webpages are completely loaded and scrolled 2 or 3 times from top to bottom of the page, then it is all good. All the problems occur when page is still loading in fore- or background in any or all of the tabs. I tried to run Firefox with all add-on and plugins disabled, tried to refresh Firefox from troubleshoot information. But nothing helps. I even uninstalled and reinstalled Firefox. I guess my laptop is not having memory issues. I am using Windows 7 x64 based system. RAM is 4 GB. All other software work well. Most importantly, Chrome has no such issues in comparison to Firefox. Also, when IDM (internet download manager) takes over some downloads, the Firefox hangs for few seconds. Please help.
Thank you.

You can try to disable hardware acceleration in Firefox.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
You need to close and restart Firefox after toggling this setting.
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window

Latest version of Firefox does not even start up, it just stays in Processes but refuses to be shut down or started up. Same with Beta.

I've had an old firefox installer which I have been using for some time, though a few days ago it tried to update to a new version. Up comes an update bar as usual. Problem is when it is done firefox does not start. Left in processes in task manager is a firefox which refuses to be killed. Any further tries to start firefox will just add another process also unable to be killed. Before I had to reboot the computer every time it tried to update, just to be able to uninstall firefox and install the older version I had. Now, unfortunately, I deleted that old version, so now I have no functioning firefox at all. Same thing happens with the latest beta version.

i forgot the exact text of the original error message, but it was looking for a *.dll that was not there - as if the install had not completed.
tried re-installing & it would stop in the middle of the download with a completely different error message - i was going to screen grab it, but then i got it to work!
Anyway, after uninstalling everything related to iTunes, emptying my recycle bin, cleaning up a bunch of unnecessary files, and stopping some programs that were running in the background (using task manager) - i did a complete re-install from the Apple iTunes website & it worked fine.
thanks!
dw

Firefox is not running/starting although it is installed on my computer

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