Since three days ago, Firefox will not start. None of the remedies on your site seem to work.

Internet explorer seems to work fine. When I click on the Firefox icon, the curser indicates that Firefox is trying to open but nothing else happens. When I go to task manager, it will list every time that I tried Firefox as an open session but there is still nothing else indicating that I have successfully opened a Firefox session. I have tried to uninstall and re-download several different versions of Firefox with the same results. It will still not start. When I go to the Programs folder and choose the .exe file under firefox, I still get nothing. I have run my antivirus program, done a disk cleanup and run the disk defragmenter and still get nothing when I try to start Firefox.

'''Try the Firefox Safe Mode''' to see how it works there. The Safe Mode is a troubleshooting mode, which disables most add-ons.''
''(If you're not using it, switch to the Default theme.)''
* You can open the Firefox 4.0+ Safe Mode by holding the '''Shift''' key when you use the Firefox desktop or Start menu shortcut.
* Or use the Help menu item and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
''Don't select anything right now, just use "'Start in Safe Mode"''
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut (without the Shift key) to open it again.''
'''''If it is good in the Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one.
Please follow the [[Troubleshooting extensions and themes]] article for that.
''When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.''

Similar Messages

Firefox will not start, have repeatedly reloaded it form your site, on my XP (SP£) PC?

Desktop icon / exe file will not start Firefox. Have repeatedly downloaded it & works for a short time & then fails. Also experiencing screen freezing, having to restart PC - are these connected?

A possible cause is security software (firewall,anti-virus) 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 and the plugin-container 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.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

Suddenly Can't Open PDFs. Starting about three days ago firefox will no longer open any PDFs. I get a blank page in a new tab.

Suddenly Can't Open PDFs in Firefox. Starting about three days ago firefox will no longer open any PDFs. I get a blank page in a new tab. Nice timing, with finals and everything where I need to view PDFs of practice tests.

Mozilla Firefox did not do their job, here. I am an editor and am constantly online. Now, I have to go to Safari to download PDFs. I reinstalled an earlier version of Firefox to get rid of the problem, but somehow Firefox has deactivated my PDF download feature. This is a total wreck and I am so angry I could spit. Stop launching new products until you have fully tested them. Customers are not your guinea pigs. Please fix this now- and fire a few idiots on the way- the ones who let this happen.

Since updating a day ago, Firefox will not open on full screen on Windows 7

Accessing from taskbar on Windows 7 shows its open but will not open on full screen. And its also affected my Quicken program, doing the same thing. I uninstalled and reinstalled, still same problems. Did the updates affect my computer? And adobe was updated at the same time. I spent two hours w/ Quicken support, problem still exists. The only change that was made to the computer was the Mozilla update.

Right-click on the shortcut used to open Firefox and select Properties. If you get a Windows Jump list when you right click, right-click on the Firefox entry in the jump list and select properties.
In the Shortcut tab of the properties dialog box, set the Run option to Maximized, then click OK to save the settings.
You can do this for any program.

After downloading and installing a security update an hour ago, firefox will not start

After going online this morning, using my firefox browser, a box came up saying a security update was available and should be downloaded and installed. This was done with no apparent problem. At the end of the update a note came up saying the update would come into operation after restarting my computer. This I did. The computer started normally, but after clicking on the firefox icon the program did not start. My computer is using Windows XP Service Pack 3.

hello tncovery, does it work when you download the full setup file from getfirefox.com again & install it on top of your current installation?

When starting FireFox, a message is displayed "script error" message related to Chrome - FireFox will not start regardless of the answer I select - how can I get FireFox to display so I can turn off all plug-ins? Safe Mode does the same thing.

This problem isn't on this system - but a system I support at our church.
When FireFox is started the first display is the message "A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete. Script: chrome://tavgp/content/libs/include.js:1101". There are two option buttons - Continue and Stop Script. Selecting either button closes that window - BUT the FireFox window is never displayed.

Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.
*Download the full Firefox installer and save the file to the desktop<br>https://www.mozilla.org/en-US/firefox/all/
If possible uninstall your current Firefox version to cleanup the Windows registry and settings in security software.
*Do NOT remove "personal data" when you uninstall your current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including data in profiles created by other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*(32 bit Windows) "C:\Program Files\Mozilla Firefox\"
*(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"
*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 personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.
If you keep having problems then also create a new profile.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

TS1702 I have an app that appears to need to be updated. I clicked to update three days ago. It has started to update and will not finish. How can I delete the app while its in the middle of updating?

IPhone 5
I have an app that appeared to need to be updated. I clicked to update three days ago. It has started to update and will not finish. How can I delete the app while its in the middle of updating?

Locked on an update can mean a couple of different things. So there are a number of things to try, but start with these.
If you have a "waiting" icon, try tapping on the icon and see if you can pause the update/download. Of it pauses, tap on it again and see if it will resume.
Try holding down on the icon until all of the icons on the screen wiggle. If the X to delete pops up on the waiting/stalled app - tap the X to delete the app. Tao,the home button and the apps will stop wiggling.
You can also try this and see if the downloads will resume. Reboot the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider if it appears on the screen - let go of the buttons. Let the iPad start up.

After upgrading to 27, firefox will not start. Saw an error message during the upgrade process.

After upgrading to 27, firefox will not start. Saw an error message during the upgrade process but cannot remember.
Tried to run firefox.exe -P but receive error message:
XML Parsing error: undefined entity
Location: chrome://mozapps/content/profile/profileSelection.xul
Line number 18, Column 1:
<dialog
^
Running on Windows XP SP3. No problem whatsoever before upgrading to 27. Sending this from Chrome as I cannot open Firefox at all.

Thanks jschaer2000: after starting it once in safe mode, I closed Mozilla and tried several restarts in normal mode. So far, all worked:-)
Thank you very much again.
Still the automatic update process bothers me: it took me several days to discover the reason to the malfunction, since when I removed the problematic version from Add and Remove Programs, I didn't pay attention at first that it was another version, not v26 which I installed from my folder.
In addition, I like to save the installation files before I run new programs and if I didn't have v26 exe file, I couldn't have operated Mozilla at all. Not that it was fun to remove and install again each time v27 didn't react, but it was better than nothing, I still prefer Mozilla over its competition.

Firefox will not start, even in Safe Mode. Evidence suggests that this is due to an incompatibility with the latest update of Java.

Firefox will not start in WinXP. (I am sending this from an alternate browser.)
I believe that this is due to some incompatibility with the latest update of Java. I believe that one of the tabs from my previous session included a Java application, and this is causing the difficulty. In recent days, since the last update of Java, I have had difficulty in loading linked pages with Java applications into Firefox, and have needed to switch to a different browser to do this.
Now I cannot even start the browser, presumably due to the presence of a Java application on one of the restored tabs.
When I now try to start Firefox, my ZoneAlarm security s/w presents the message "Java(TM) Quick Starter binary is trying to access the Internet." I click "Allow", but Firefox will not start. If I click "Deny", the same result. The same thing happens when I try to start Firefox in Safe Mode, I cannot even start Firefox in Safe mode.
== This happened ==
Every time Firefox opened
== after recent update of Java

You can try to disable the Java Quick starter and the Java Console extension in the Control Panel > Java.
Control Panel > Java > Advanced tab > Miscellaneous >Java Quick Starter (disable)
You can also disable the Java plugin in Firefox: Tools > Add-ons > Plugins
See [[Troubleshooting extensions and themes]]
See [[Troubleshooting plugins]]

Firefox will not start until reboot

I am using FF newest version, win 7, etc. I have a very strange problem. Sometimes, once every 2-4 days, my FF will not start when the computer first start. That's when the computer cold boot, I click on FF and nothing happens. I looked in task manager and there is no "firefox.exe" running. If I reboot the machine, now it boots properly. I tried clicking on the shortcut on desktop, in "All Program" or navigate to the location of "firefox.exe" on disk. I have no fancy addon's. Google TB, Download helper, Ad block plus, and Skype addon, noscript, siteadvisor, DNA (bittorrent client for Asus), Chatzilla. Any suggestion on how I can diagnose/fix this problem? tx

Hello friend, i have a suggestion:
Sometimes my Firefox closes and the same thing happens... So I close the process, on the Task Manager (famous ctrl + alt + del on Windows) and start Firefox again. Try it!:D
[]'s

Firefox will not start on limited account. Reports firefox already running but doesn't show in task manager. Adminstrator account work fine

Firefox will not start on limited accounts. It reports firefox already running. This happens even if no other users are logged on. Administrator accounts have no problems accessing firefox

Create a new profile as a test to check if your current profile is causing the problems.
See Basic Troubleshooting: Make a new profile:
*https://support.mozilla.com/kb/Basic+Troubleshooting#w_8-make-a-new-profile
If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Just installed Firefox 3.6. Firefox will not start and Firefox safemode does not start either. Using Task manager I do not see if started either. If I create a new profile and start from that window, Firefox starts up. I see no error windows/messages. I d

Just installed Firefox 3.6. Firefox will not start and Firefox safemode does not start either. Using Task manager I do not see if started either. If I create a new profile and start from that window, Firefox starts up. I see no error windows/messages. I do have it listed in my Firewall as an exception program with Permit All. What is happening?
== This happened ==
Every time Firefox opened
== After removing Firefox and Reinstalling it. ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; GTB6.4; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; MS-RTC LM 8)

If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)
See http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
See also [[Basic Troubleshooting|#Make_a_new_profile|Basic Troubleshooting: Make a new profile]]

After removing system fonts and reinstalling fonts, FireFox will not start

After removing system fonts and reinstalling fonts, FireFox will not start! When I start FireFox the "Mozilla Crash Reporter" opens as if FF just crashed??? I don't see any records in event viewer. I am using FF v3.6.3 on a Windows 7 box. I tried uninstalling 3.6.3 and installing 3.0.18 and had the same problem!
== This happened ==
Every time Firefox opened
== After a uninstalled all fonts including system fonts and then reinstalling system fonts. ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB6.4; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; AskTB5.5)

The files with submitted crash report ids are inside the ''submitted '' directory, from the directory you found the LastCrash.txt timestamp file.
The file names will begin with '''bp-'''
There might be more information from the crash report, but it might just tell us you are crashing the first time Firefox tries to use a font.
One thing I suppose you could do is select only those fonts you've got in Tools -> Options -> Content -> Fonts and Colors -> Advanced and then uncheck the '''Allow pages to use their own fonts''' option.
See http://support.mozilla.com/en-US/kb/Options+window+-+Content+panel#Fonts_Dialog
To be honest, I can't find anything on this Netscape Font Navigator and it sounds highly dubious.

Askcom has taken over as my browser firefox will not start, how do I get rid of askcom

firefox will not start. When I try to open firefox my computer displays askcom every time. I would like to get rid of askcom, I do not know how it got in my computer. I have tried to remove it in Win 7 programs and features but it will not go away.
My O/S is Win 7 Home addition.

''how do I get rid of ask.com''
See
:All of a sudden Ask.com showed up today as my default rather than Google. How do I get my Google back?
:'''https://support.mozilla.com/questions/868741'''
<br><small>Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.</small>
a good starting place for problems with extensions and toolbars are
:http://kb.mozillazine.org/Problematic_extensions
:http://kb.mozillazine.org/Uninstalling_toolbars

Firefox will not start at all

New versions of Firefox will not start and only bring up the crash reporter. I've tried starting in safe mode, I've deleted/created new Profiles and I've uninstalled/installed Firefox over and over. I can still download 28.0 and it has no problem opening. Below is the latest Crash ID from 35.0
Crash ID: bp-4ac8fb2d-9a2a-4a6a-a9e4-06cc42150125

hello sid.robinson, this crash is caused by the "Digital Guardian" software by Verdasys that is running on your computer. Please see if there's an update available for that program.

Since three days ago, Firefox will not start. None of the remedies on your site seem to work.

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