Firefox won't start at all

I had an issue with a device being installed on my laptop, as recommended I ran something on the command prompt program, after that firefox has not started, I thought easy solution was uninstal/ re install, no luck, please help, I single, double, triple! click the icon and it just wont start. Please help.

Did you check your security software (firewall)?
A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, 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.
See [[Server not found]] and [[Firewalls]] and http://kb.mozillazine.org/Firewalls
See also:
* http://kb.mozillazine.org/Browser_will_not_start_up
* http://kb.mozillazine.org/Error_loading_websites

Similar Messages

Sometimes Firefox won't start at all. If I restart the laptop, it does eventually start up. I am wondering if it is having problems with BitDefender wh;ich we have installed on the laptop and appears to be slowing online work.

When this occurs, Internet Explorer usually will start, but sometimes it is affected also and similarly will not start until the laptop is re-booted. I have tried all possible ways of starting Firefox but there doesn't seem to be any difference. Occasionally Firefox will start after some other work is done on the laptop without re-booting. Other work requiring an internet connection (updates mostly) do not seem to be affected ie. they work OK even when Firefox and Internet Explorer won't start. When I say "won't start" there is no message or anything, they just won't start.

LionStone wrote:
Now I feel stupid. The problem was that my system partition was full. I removed some files and now it's back to normal. but D-Bus still fail.
hmm... I probably shouldn't have used the default values on install
Is it really failing? Please check the permissions of the .config folder at your user's directory.

Firefox won't start at all. Installation is complete and on the computer.

The shortcut icon and start icon failed to start Firefox. I reloaded 3.6 and received the "success" message. Double clicking the icons has no results. How to I start Firefox, I love this program.

Your crashreport is: 
[https://crash-stats.mozilla.com/report/index/0257823b-cb63-4ae2-b3f8-942e52110929 https://crash-stats.mozilla.com/report/index/0257823b-cb63-4ae2-b3f8-942e52110929] 
Firefox 7.0 Crash Report [@ mozcomp.dll@0xab51 ] 
NEW Startup crash in mozcomp.dll with Oracle Enterprise, F5 Networks, Passlogix V-GO, IBM Tivoli Access Manager SSO

I had Firefox 6.0 and took the 6.0.1 upgrade, now Firefox won't start at all. Will someone help me, please?

When I attempt to run Firefox I get a "XUL Runner" error pop-up that states
"Error: Platform version '6.0' is not compatible with
minVersion >=6.0.1
maxVersion <=6.0.1"
My OS is Windows XP Pro

That's what happened to me too after I upgraded to firefox 4 and it wouldn't connect to my internet. Now I'm stuck with Internet Explorer with none of my important personal information like my favorites.

Firefox update failed, so I re-installed. Now firefox won't start up at all?

''locking as a duplicate of https://support.mozilla.org/en-US/questions/969557''
So I ran firefox, and it was updating. While updating, firefox crashed for no apparent reason so I had to close it. Afterwards, every time I tried to start up firefox, it gave me the update failed error, followed by a crash less than a second later. I followed some instructions, uninstalling and re-installing firefox (without removing personal data), but now firefox won't start up at all!
Now what?

We're sorry to hear that your Firefox seems to be crashing when you open it. Please perform the following steps to give us a crash report ID that helps us find out more about the cause of the crash.
#Press the following shortcut to get a Run window: [Windows] + [R]. This should bring up a window that contains a text field.
#In that text field, enter %APPDATA% and press Enter. An explorer window should open.
#From that explorer window, double-click on the ''Mozilla'' folder, then double-click on ''Firefox'' and then on ''Crash reports''. Double-click on ''submitted''.
#Now, you should see a list of files that contain reports. Go to ''View'' > ''Arrange Icons by'' > ''Modified'' to get the most recent files at the top of the window.
#Open the most recent 5 files with a text editor and copy the IDs.
#Paste each ID with '''bp-''' into the reply window on the forums.
Thanks in advance!
You can find more information and troubleshooting steps in the [[Firefox crashes]] article.

Firefox won't start after google chrome imported all data(bookmarks,passwords,history,etc) from firefox

firefox won't start after i import the data to google chrome.

Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
See also:
*http://kb.mozillazine.org/Browser_will_not_start_up

Firefox won't open; tried all I found on this site; can't get in to disable add-ons.

Firefox will not open. Little wheel spins, then disappears. Nothing.
Re-started computer - several times.
Reinstalled Firefox. Nothing. Can't open in Admin. Can't open with double click or with right-click "Open".
Many fixes on this site suggest going to the Firefox button to disable add-ons - of which I have few - however since Firefox won't start, I can't try these options.
Can't get to my profile. (Have not changed my profile or add-ons for ages.)
This seems to have happened right after the most recent update.
I've read everything I can find on this website and other places, and can't make it work.
Can't find old Firefox on program list, thus can't uninstall old version - perhaps this occurred automatically with new Firefox download?.
Ran Spybot and deleted some adware and mal-ware. Still nothing. Ran Microsoft Security - nothing.
I'm running Windows 7.
I can't open the troubleshooting file offered below.
Firefox was working well until yesterday. Sigh. Can anyone help with this?

You can use one of these to start Firefox in Safe Mode:
*On Windows, hold down the Shift key while starting Firefox with a double-click on the Firefox desktop shortcut
*On Mac, hold down the Options key while starting Firefox
*Help > Restart with Add-ons Disabled
*https://support.mozilla.org/kb/Safe+Mode
Create a new profile as a test to check if your current profile is causing the problems.
Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 22.0: 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 lose 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.
*(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 that "remove personal data" is NOT selected when you uninstall Firefox.
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
Do a malware check with some malware scanning programs on the Windows computer. 
Please scan with all programs because each program detects different malware.
Make sure that you update each program to get the latest version of their databases before doing a scan.
*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
*SuperAntispyware: http://www.superantispyware.com/
*Microsoft Safety Scanner: http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: Home Page: http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
*Spybot Search & Destroy: http://www.safer-networking.org/en/index.html
*AdwCleaner: http://www.bleepingcomputer.com/download/adwcleaner/ http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
*Kasperky Free Security Scan: http://www.kaspersky.com/security-scan
You can also do a check for a rootkit infection with TDSSKiller.
*Anti-rootkit utility TDSSKiller: http://support.kaspersky.com/5350?el=88446
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

Firefox won't start, and I cannot download the new version as it keeps saying 'unspecified error' when I try

We (my wife and I) downloaded the new version of firefox, but found that it was being very jerky and slow and just didn't really like how it looked. My wife did a system restore on our computer to see if that helped, and since then firefox hasn't started at all - if we double click on the icon, it looks like it's doing something and then it just doesn't open. Whenever I try and download it again it comes up with 'unspecified error'. I've tried deleting all the firefox program files from my computer first, but there is one file in conponents that it won't let me because I need administrator permission. It doesn't seem to make any difference anyway.

Using "System Restore" can cause your Firefox installation to get corrupted because not all files are restored (only files in a white-list), so be cautious with using System Restore. 
You need to (re)install software that was affected. 
Remove the Firefox program folder (C:\Program Files\Mozilla Firefox\) before reinstalling a freshly downloaded Firefox copy to do a clean install.
You can find the latest Firefox release in all languages and for all Operating Systems here:
*Firefox 11.0.x: http://www.mozilla.org/en-US/firefox/all.html
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

Firefox won't start, there is no error message and it is not already running.

Hi,
When I try to click on firefox, the little wait icon appears and then disappears. Nothing opens, not even safe mode. I've looked at the "Firefox won't start and there is no error message" help section and looked at my task manager processes. It seems that when I click firefox, it briefly appears on my processes and then disappears. This happened yesterday while I was in the middle of using it. At the same time, my Skype also crashed, which makes me think the two are correlated. The two programs still don't work. The only way that I can open firefox is if I install it all over again with the "launch firefox now" option checked at the end. When I have a firefox window open, I can open other firefox windows just fine. When I close it, nothing opens. Thanks for your help.

1) Start Task Manager
2) Open Processes (make the description area large enough to see)
3) look for a description that says ''firefox''
4) Select it and press End Process
'''Now Firefox should work properly.'''

Firefox won't start; no error message; profile manager also won't start. What can I do?

Suddenly, firefox won't start. I get no error message--it just won't open. System restore to a month before the problem did not help.
From the suggestions on this page: http://support.mozilla.com/en-US/kb/Firefox%20will%20not%20start... I did not recently install add-ons or clean the registry, so I think it may be a profile problem. But profile manager will not open--only a tiny window with a white rectangle and no text.
I would like to not lose all my bookmarks. And I would like to continue using Firefox.
What can I do?

dmcritchie, thank you for your reply!
Before I received your response, I tried something that seems to have worked. I used Chrome to go to the Firefox website and downloaded Firefox (without uninstalling it first) and went through the installation process again. For some reason, this worked, even though I already had the latest version of Firefox, and I can now open Firefox successfully.
If it stops working again, I will try your suggestion. In the meantime, thank you much!

Firefox won't start after windows update

After windows Updated my computer Firefox won't start. I tried a clean reinstall two times, won't work. When I tried to start the firefox the first time after booting my computer it comes with the following message.
XML Parsing Error: undefined entity
Location: chrome://mozapps/content/extensions/update.xul
Line Number 14, Column 1:
<wizard id="updateWizard"
^
Any Help would be greatly appreciated. I like firefox and I'm using it the last 7 Years.
Thanks
DK

I cheated a little bit and put the issue url in a working version of firefox:
chrome://mozapps/content/extensions/update.xul
What I got was a page that looked like this below and console:
blah blah parser:
<pre><nowiki> xml-stylesheet
xml-stylesheet
<wizard id="updateWizard" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" title="Firefox Update" windowtype="Addons:Compatibility" branded="true" onload="gUpdateWizard.init();" onwizardfinish="gUpdateWizard.onWizardFinish();" onwizardcancel="return gUpdateWizard.onWizardCancel();" onclose="return gUpdateWizard.onWizardClose(event);" buttons="accept,cancel" pagestep="1" currentpageid="dummy" firstpage="true" lastpage="true">
<script type="application/javascript" src="chrome://mozapps/content/extensions/update.js"></script>
<stringbundleset id="updateSet">
<stringbundle id="brandStrings" src="chrome://branding/locale/brand.properties"></stringbundle>
<stringbundle id="updateStrings" src="chrome://mozapps/locale/extensions/update.properties"></stringbundle>
</stringbundleset>
<wizardpage id="dummy" pageid="dummy"></wizardpage>
<wizardpage id="offline" pageid="offline" next="versioninfo" label="Firefox is working offline" onpageadvanced="return gOfflinePage.onPageAdvanced();">
<description></description>
<checkbox id="toggleOffline" checked="true" label="Go online now." accesskey="G" oncommand="gOfflinePage.toggleOffline();"></checkbox>
</wizardpage>
<wizardpage id="versioninfo" pageid="versioninfo" next="mismatch" label="Checking Compatibility of Add-ons" onpageshow="gVersionInfoPage.onPageShow();">
<label>
Checking your add-ons for compatibility with this
</label>
<separator class="thin"></separator>
<progressmeter id="versioninfo.progress" mode="undetermined"></progressmeter>
<hbox align="center">
<image id="versioninfo.throbber" class="throbber"></image>
<label id="versioninfo.status" flex="1" crop="right"></label>
</hbox>
<separator></separator>
</wizardpage>
<wizardpage id="mismatch" pageid="mismatch" next="checking" label="Incompatible Add-ons" onpageshow="gMismatchPage.onPageShow();">
<label></label>
<separator class="thin"></separator>
<listbox id="mismatch.incompatible" flex="1"></listbox>
<separator class="thin"></separator>
<label>
Firefox can check if there are compatible versions…
</label>
</wizardpage>
<wizardpage id="checking" pageid="checking" next="noupdates" label="Checking for Compatible Add-ons" onpageshow="gUpdatePage.onPageShow();">
<label></label>
<separator class="thin"></separator>
<progressmeter id="checking.progress"></progressmeter>
<hbox align="center"></hbox>
</wizardpage>
<wizardpage id="noupdates" pageid="noupdates" label="No Compatible Add-ons Found" onpageshow="gNoUpdatesPage.onPageShow();">
<description></description>
<separator class="thin"></separator>
<hbox id="updateCheckErrorNotFound" class="alertBox" hidden="true" align="top"></hbox>
<separator class="thin"></separator>
<description id="noupdatesCheckEnabled" hidden="true"></description>
<vbox id="noupdatesCheckDisabled" hidden="true"></vbox>
<separator flex="1"></separator>
<label></label>
<separator class="thin"></separator>
</wizardpage>
</nowiki></pre>
I do not see much about coloum 14, but I am guessing this file is stored somewhere and its corrupt. Update.xul suggests that it is the update file. Do you still have this in your downloads folder? There are two places for update and for a clean reinstall:
[http://www.mozilla.org/en-US/firefox/new/] in a private window will give you a new install or you can choose from here: [https://www.mozilla.org/en-US/firefox/all/]
This is what the file should look like; [http://hg.mozilla.org/mozilla-central/log/7a2edc5171e6/toolkit/mozapps/extensions/content/update.xul] If you can copy and paste that file from a working browser we can see the issue, but it will just look the same as the error.
if you can replace the contents of the file locally with what it should look like it will fix the error, but who knows if there are other errors. May be best to delete the updater and save all the profile folder contents.

Firefox won't start in any form

I have never had any real problems with firefox not starting in the past, but today I adjusted my internet settings to allow firefox to delete cookies, cache, etc whenever the program was shut down. After doing that, I went to re-open firefox and it would start up, but always "not respond". After 2 or 3 attempts of this with the same result, I restarted my computer and now Firefox will not start at all. The hour glass will pop up for a few seconds, then disappear. The firefox window will not open, but it shows up in the process' list in Win. 7's task manager.
things I have done:
Ran Malware check's using 4 different programs (malware bytes, hitman, etc)
Ran rootchecker
Ran my norten antivirus.
Everything that was found (not allot) was removed.
The Firefox window Does NOT open at all
I cannot open Firefox's "Safe" mode
Firefox will not open in Window's safe mode
I have un-installed and done a clean re-install, and the problem is still there.
Can someone please help, as I have a few hundred bookmarks I can't lose, and I hate using IE, Safari, Chrome, etc.

Hello,
Please see the 'Firefox Previously Worked' section of the support article below.
[https://support.mozilla.org/en-US/kb/firefox-wont-start-find-solutions#w_firefox-previously-worked Firefox won't start] (previously worked).
You need to use the [https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles Profile Manager] to create a new profile. This should allow Firefox to open. You can then migrate your bookmarks, personal data etc across to the new profile.
I hope that helps. Please let me know if not.

Firefox won't start up, when clicked, whereas every other browser works.

Firefox won't start up, when clicked, whereas every other browser works.

See:
*http://kb.mozillazine.org/Browser_will_not_start_up
Can you start Firefox in Safe mode?
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
You can use one of these to start Firefox in Safe mode:
*On Windows, hold down the Shift key while starting Firefox with a double-click on the Firefox desktop shortcut
*On Mac, hold down the Options key while starting Firefox
*Help > Restart with Add-ons Disabled
Another 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

After reboot firefox won't start. runs in task manager, but won't pop up. reset, safe mode and uninstall/re-install won't help. ok if no reboot.

win7 Pro. has been running firefox ok. but lately with 25 and now 26, the firefox won't start. I can see firefox is running in task manager. but it just won't pop up.
if I download it again and install it, it will run, but every time I reboot the system, it just won't run again.
try: reset, safe mode, uninstall & reinstall, new/clean profile, none of those work.

There may be a corrupted file on Firefox. 
Please attempt to perform a clean reinstall. [https://support.mozilla.org/en-US/kb/forum-response-clean-reinstall (More Details)] This is different than a regular uninstall.
If a clean reinstall does not fix the issue, please try starting your operating system in safe mode. 
To do so, please do the following:
#Ensure that your computer is shut down completely
#Press the power button
#Tap the <code>F8</code> key repeatedly before the Windows logo and startup screen is displayed
#Select Safe Mode With Networking for the advanced startup options list
Please report back with the results of both solutions.

I killed a MacBook Pro. Shutdown with flash in drive and now it won't start at all.

I may have killed my MacBook Pro OS X by accidentally restarting with a Flash Drive it it and now it won't start at all. Any ideas?

So it is powering on. You did not state that before. In that case:
Reinstalling OS X Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Also see this if above doesn't work:
Install OS X from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
      the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
4. Quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
           because it is three times faster than wireless.
This should install the original version of OS X that came on the machine.

Firefox won't start at all

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