I can't start Firefox.

I get a message that I must reboot since Firefox was upgraded, but when you reboot and try and start firefox, you get the same message again. How do I solve this problem?

Hi g.mearns-
It sounds like it would be a good idea to uninstall, and then download the latest version of Firefox by following these steps:
* Get the latest version: http://www.mozilla.org/en-US/firefox/new/
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version.
* 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.
* Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall 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.
* Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
I hope this helps!

Similar Messages

Firefox is freezing. When I close Firefox, and try to re-start it, it will not open. I need to access Task Manager, where I find Firefox still running. I close Firefox in Task Manager & can re-start Firefox.

Firefox is freezing in the middle of a browsing session. When I close Firefox, and try to re-start it, it will not open. I need to access Task Manager, where I find Firefox to still be running. Once I close Firefox in Task Manager, I can re-start Firefox. This can happen several times in the space of a few hours? I'm running Vista Home premium with Firefox 3.6.16, and this problem has only started in the last 4 weeks. Can Anyone Help? Core 2 Duo E7300 with 4GB RAM.

Sounds like it is hanging when you exit and later try to restart Firefox.
* How to stop the running Firefox process
** In Task Manager, does firefox.exe show in the '''Processes''' tab?
** See: http://kb.mozillazine.org/Kill_application
**Windows 7 users: http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576
* What may cause Firefox to hang at exit
**Windows 7 Task Manager: http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576
** http://support.mozilla.com/en-US/kb/Firefox+hangs
** http://kb.mozillazine.org/Firefox_hangs
** https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding
* You may need to try Firefox Safe Mode
** You may need to use '''Safe Mode''' to locate the problem: ***See: http://kb.mozillazine.org/Safe_Mode
***Firefox 4 users, hold the Shift key while clicking the Firefox 4 desktop icon to enter Safe Mode.
***Firefox Safe Mode is a diagnostic mode that disables Extensions and some other features of Firefox.
****In Firefox 4, Safe Mode also disables Plugins and Hardware Acceleration.
****If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes '''before''' starting Safe Mode (In Firefox 4, Tools > Add-ons > Appearance). See: http://support.mozilla.com/en-US/kb/Using%20themes%20with%20Firefox#w_managing-themes-and-personas
****When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode".
****Test to see if the problem you are experiencing is corrected.
*** If the problem does not occur in Safe-mode then disable all of your Extensions and Plug-ins and then try to find which is causing it
***#by enabling '''one at a time''' until the problem reappears.
***#You can also enable a few at a time (3-5), keeping track of what you just re-enabled to see if the problem re-occurs; this will help narrow down the possibilities if you have a large number of add-ons.
***#'''You MUST close and restart Firefox after EACH change''' via File > Restart Firefox (on Mac: Firefox > Quit).
***#You can use "Disable all add-ons" on the Safe Mode start window.
**See the following for more information
*** http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes
*** http://support.mozilla.com/en-US/kb/Troubleshooting+plugins
*** http://support.mozilla.com/en-US/kb/Basic+Troubleshooting
 
 
'''You need to update the following:'''
*Adobe Shockwave for Director Netscape plug-in, version 11.0
*Shockwave Flash 10.2 r152
#'''''Check your plugin versions''''' on either of the following links':
#*http://www.mozilla.com/en-US/plugincheck/
#*https://www-trunk.stage.mozilla.com/en-US/plugincheck/
#*'''Note: plugin check page does not have information on all plugin versions'''
#*There are plugin specific testing links available from this page:
#**http://kb.mozillazine.org/Testing_plugins
#'''Update Shockwave for Director'''
#*NOTE: this is not the same as Shockwave Flash; this installs the Shockwave Player.
#*Use Firefox to download and SAVE the installer to your hard drive from the link in the article below (Desktop is a good place so you can find it).
#*When the download is complete, exit Firefox (File > Exit)
#*locate and double-click in the installer you just downloaded, let the install complete.
#*Restart Firefox and check your plugins again.
#*'''Download link and more information''': http://support.mozilla.com/en-US/kb/Using+the+Shockwave+plugin+with+Firefox
#'''Update the [[Managing the Flash plugin|Flash]] plugin''' to the latest version.
#*Download and SAVE to your Desktop so you can find the installer later
#*If you do not have the current version, click on the "Player Download Center" link on the "'''Download and information'''" or "'''Download Manual installers'''" below
#*After download is complete, exit Firefox
#*Click on the installer you just downloaded and install
#**Windows 7 and Vista: may need to right-click the installer and choose "Run as Administrator"
#*Start Firefox and check your version again or test the installation by going back to the download link below
#*'''Download and information''': http://www.adobe.com/software/flash/about/
#**Use Firefox to go to the above site to update the Firefox plugin (will also install plugin for most other browsers; except IE)
#**Use IE to go to the above site to update the IE ActiveX
#*'''Download Manual installers'''.
#**http://kb2.adobe.com/cps/191/tn_19166.html#main_ManualInstaller
#**Note separate links for:
#***Plugin for Firefox and most other browsers
#***ActiveX for IE

Can't start Firefox

I can't start Firefox. I try double click, right click->open or press enter but nothing work. Then I look at processes in task manager, don't have firefox.exe there. And there isn't any error message.
I already try restart computer or reinstall firefox several time but nothing happen.

It doesn't work. I can't go to profile manager :( I try "start => run" way. Is there another way?
And there's another error happen the same day with this problem. I don't know but maybe it can help. This happen when I try to open any link from YM.

How can I start firefox with new tab instead of blank page?

Today I update firefox to 13.0. I like the new "new type". I want to konw how can I start firefox with new tab instead of blank page?
I don't want to change the homepage to about:newtab.
Sorry for my bad English.

This is a very annoying thing. Every update from Firefox resets this config setting back to about:newtab. I changed '''''browser.newtab.url''''' in 12.x to '''''about:blank''''' and it resetted back in update 13.0 and now I have to do the same thing again in 13.0.1.
The drawback with about:newtab is Firefox opens up dataports for every URL that are linked and gets reopened for every lame 'newtab' you click on. Just use [http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx Tcpview - data port viewer] and watch how many extra dataports that opens up from this crazy 'feature'.

Why I can't start firefox like this?

<blockquote>Locking duplicate thread. 
Please continue here: [[/questions/960958]]
</blockquote>
I put “ "C:\firefox\firefox.exe" -osint --no-remote -profile "C:\firefox\profile" -url "www.google.com" “ in cmd.exe ，why my firefox can't start？

This function may not be available for mobile yet. You can put your suggestions to the [[Suggestion Box]]. Thanks!

I can't open Firefox and I haven't saved my extensive bookmarks, which contains all my important websites. How can I start Firefox and save my bookmarks?

I have a Dell Inspiron E1505, and I use Kaspersky Internet Security. The past week, I've had problems opening Firefox - it has been slow. Today, it just won't open at all. At first I thought it was my Internet connection, so I called my provider, Comcast Cable. But I was also able to open Internet Explorer. I was told that I may have to remove Firefox, and redownload it, but it would erase all my bookmarks. How can I access Firefox and save my bookmarks?

Try starting Firefox in Safe Mode (Firefox Safe Mode, not Windows Safe Mode).
First, I recommend backing up your Firefox settings in case something goes wrong. 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.)
Next, check out this article:
[http://support.mozilla.com/kb/Safe+Mode Safe Mode]. Be careful not to "reset" anything permanently if you didn't back up.
To export bookmarks to an HTML file that IE and other browsers can read, see [https://support.mozilla.com/en-US/kb/Exporting%20bookmarks%20to%20an%20HTML%20file Exporting bookmarks to an HTML file | How to | Firefox Help].
Any luck?

I can't start Firefox on my Mac - every time I open it, it crashes. Please help!

I can't open Firefox at all - and can't find a safe mode. Have tried to re-install it, but it still opens with the same add-ons that are causing it to crash. Please help!

Hello David171212,
You can contact Apple Support and ask them the reason of Declining your Payment, There are chances that your Bank might not be releasing the payment or something like that due to which you are getting Payment Declined Message. The Best of option is to contact your Bank or you can contact Apple and ask them the reason.
Apple Contact Numbers : http://support.apple.com/kb/he57
Hope this will help you

How can I start Firefox in a brand new session?

I got onto a malware site that wants to scan my computer for viruses. There is currently a popup window that says "Threat Detected. Please click the Protect button to make your system safe." I don't want to do that.
I can't close the popup by clicking the 'X' in the upper corner. No other options are available in Firefox. Everything is disabled until I press Protect.
I restarted the computer and restarted Firefox, and the first thing I see is "Threat Detected".
So I want to start a new session so the malware Tab won't open from the previous session.
(I'm using Google Chrome to post this.)
Many thanks....

Delete [http://kb.mozillazine.org/sessionstore.js sessionstore.js] and sessionstore.bak in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Profile Folder] to make Firefox forget the previous session.
You will have to redo App Tabs and Tab Groups after deleting sessionstore.js.
See:
* http://kb.mozillazine.org/Session_Restore

Can't start Firefox when clicking on a shortcut, getting notice that procedure entry point PORT_LoadLibraryFrom Origin could not be located in the dynamic link library nssutil3.dll

The problem described in my question above occurred when I accidentally clicked on the Firefox while it was installing updates or was starting, etc. Then the second notice appears stating that windows was not able to correct the problem and the program will be closed.

The problem described in my question above occurred when I accidentally clicked on the Firefox while it was installing updates or was starting, etc. Then the second notice appears stating that windows was not able to correct the problem and the program will be closed.

Can't start Firefox, XULRunner reports Error: App:Name not specified in application.ini

application.ini contents:
<pre><nowiki>2 17583/20136 22 2010.09.08 23:55:35 \Device\HarddiskVolume6\yenc\Xnews.ini
1 2217/2217 1 2010.09.08 23:25:04 \Device\HarddiskVolume1\Documents and Settings\evo\Mina dokument\Hämtade filer\emule049c.exe
1 3525/3525 1 2010.09.08 23:25:04 \Device\HarddiskVolume1\Documents and Settings\evo\Mina dokument\Hämtade filer\install_flash_player.exe
2 105/985 10 2010.09.08 23:14:53 \Device\HarddiskVolume1\WINDOWS\NeroDigital.ini
1 3599/4099 1 2010.09.08 23:04:43 \Device\HarddiskVolume1\WINDOWS\Temp\AskBarDis\upgrade\UpgradeData.xml
1 3282/23225 6 2010.09.08 23:04:43 \Device\HarddiskVolume1\Documents and Settings\evo\Application Data\Mozilla\Firefox\Profiles\wu5lq6am.default\sessionstore-3.js
1 3758/3758 1 2010.09.08 22:54:32 \Device\HarddiskVolume1\Documents and Settings\evo\Mina dokument\Hämtade filer\FoxitReader.exe
1 2057/2721 1 2010.09.08 22:34:12 \Device\HarddiskVolume1\Documents and Settings\evo\Skrivbord\WinUHA 2.0 RC1 (2005.02.27).exe
1 7384/12265 2 2010.09.08 22:34:12 \Device\HarddiskVolume1\Program\Mozilla Thunderbird\thunderbird.ex</nowiki></pre>

Hi Guys I have SOLUTION for that. I perhaps could not attach my file here but let me still tell you the solution.
You need "Application.ini" file from any other pc having Mozilla over it. There is no complex information in this file although. I will past code of that file here so you could copy that to your file as it is.
After doing this if you get any different error prompting for version error then open this "Application.ini" file again where you just copied code. and change the version (you will find version text on second line at end) to appropriate one according to the Error Alert you just encountered before.
That's it.
Application.ini File Code is below
(whole code must come in three lines, I can see line break special characters in special rectangular format)
; ***** BEGIN LICENSE BLOCK *****
; Version: MPL 1.1/GPL 2.0/LGPL 2.1
; The contents of this file are subject to the Mozilla Public License Version
; 1.1 (the "License"); you may not use this file except in compliance with
; the License. You may obtain a copy of the License at
; http://www.mozilla.org/MPL/
; Software distributed under the License is distributed on an "AS IS" basis,
; WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
; for the specific language governing rights and limitations under the
; License.
; The Original Code is Mozilla Firefox.
; The Initial Developer of the Original Code is
; Benjamin Smedberg <[email protected]>.
; Portions created by the Initial Developer are Copyright (C) 2006
; the Mozilla Foundation <http://www.mozilla.org/>. All Rights Reserved.
; Contributor(s):
; Alternatively, the contents of this file may be used under the terms of
; either the GNU General Public License Version 2 or later (the "GPL"), or
; the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
; in which case the provisions of the GPL or the LGPL are applicable instead
; of those above. If you wish to allow use of your version of this file only
; under the terms of either the GPL or the LGPL, and not to allow others to
; use your version of this file under the terms of the MPL, indicate your
; decision by deleting the provisions above and replace them with the notice
; and other provisions required by the GPL or the LGPL. If you do not delete
; the provisions above, a recipient may use your version of this file under
; the terms of any one of the MPL, the GPL or the LGPL.
; ***** END LICENSE BLOCK *****
[App]
Vendor=Mozilla
Name=Firefox
Version=3.5.11
BuildID=20100701023340
SourceRepository=http://hg.mozilla.org/releases/mozilla-1.9.1
SourceStamp=56248d52ac25
Copyright=Copyright (c) 1998 - 2010 mozilla.org
ID={ec8030f7-c20a-464f-9b0e-13a3a9e97384}
[Gecko]
MinVersion=1.9.1.12
MaxVersion=1.9.1.12
[XRE]
EnableProfileMigrator=1
EnableExtensionManager=1
[Crash Reporter]
Enabled=1
ServerURL=https://crash-reports.mozilla.com/submit

After installing Win7 x32 SP1 I can not start Firefox. Not even in safe mode. I uninstalled Firefox and re-installed the program. Won't start.

After installing SP1 Firefox quit working and Internet Explore quit working. I can only use Chrome as a browser at this time.

See:
*http://kb.mozillazine.org/Browser_will_not_start_up
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
Do a malware check with some malware scanning programs on the Windows computer. 
You need to 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.
*http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
*http://www.superantispyware.com/ - SuperAntispyware
*http://www.microsoft.com/security/scanner/en-us/default.aspx - Microsoft Safety Scanner
*http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
*http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
You can also do a check for a rootkit infection with TDSSKiller.
*http://support.kaspersky.com/viruses/solutions?qid=208280684
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

Told i can't start firefox no xul.dll

happned after I down loaded update of adobe and restarted my computer

Hi g.mearns-
It sounds like it would be a good idea to uninstall, and then download the latest version of Firefox by following these steps:
* Get the latest version: http://www.mozilla.org/en-US/firefox/new/
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version.
* 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.
* Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall 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.
* Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
I hope this helps!

Tells me to reboot after I update. I have rebooted many times and can't start firefox.

I updated and went through the process and now when I click the shortcut it says "Your computer must be restarted to complete a previous upgrade of Firefox. Do you want to reboot now?" I have clicked Yes six times now and still nothing. I tried to uninstall it all together but the same message pops up. Any answers to my problem? PLEASE HELP

Do a clean (re)install:
* Download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
* Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
* Don't remove personal data if you uninstall the current version.
* 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.
Your bookmarks and other profile data are stored elsewhere (not in the Firefox program folder) and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.

When I click on Firefox.exe I get error message Can't start Firefox.exe as js3250.dll missing. When I try to re-download Firefox I get message saying can't download because Firefox is already running, but it isn't. How and where can I get js3250.dll?

Why punish me for a few too many keystrokes by deleting what I have already entered below my question. You're becoming MS.

See these posts about the same problem:
*[/questions/798251]
*[/questions/823473]

Can't uninstall firefox beta release on Windows XP as you discribe

I can't uninstall Firefox 8 beta on my Windows XP as you describe. It appears "''Your computer must be restarted to complete a previous upgrade of Firefox. Do you want to reboot now?''" Rebooting does not solve the problem. When installing a new version the same message appears. When checking for updates appears "''Firefox is up to date''".
Please advice. Many thanks in advance.
[email protected]

I found the following on that error message here: http://kb.mozillazine.org/Browser_will_not_start_up#Computer_must_be_restarted_message_after_Firefox_upgrade
'''Computer must be restarted message after Firefox upgrade'''
If you see a message similar to ''Your computer must be restarted to complete a previous upgrade of Firefox'' after a major update (e.g., from Firefox 3.6 to 8.0) and restarting the computer doesn't help: On Windows, open the Mozilla Firefox installation directory (e.g., C:\Program Files\Mozilla Firefox or, on 64-bit Windows, C:\Program Files (x86)\Mozilla Firefox) and delete the file "firefox.exe.moz-upgrade". If you still can't start Firefox, do a clean reinstall (use another browser to download the Firefox installer from www.mozilla.org/firefox and, after first removing the Mozilla Firefox installation directory, reinstall Firefox).
The above refers to an error attempting to start Firefox but the same solution might work for errors when attempting to uninstall Firefox (delete the file '''firefox.exe.moz-upgrade''' from the folder where Firefox is installed, then run the uninstaller.) See also [[Uninstalling Firefox]].

I can't start Firefox.

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