Since downloading Firefox 4.0.1 and restarting my computer, Firefox will not start.

When Firefox tries to load since updating to 4.0.1 I get an error msg - something like XULRunner Error: Platform 2.0.1 is not compatible with minVersion >= 2.0 maxVersion <= 2.0

Firefox 4 saves the previous session automatically, so there is no longer need for the dialog asking if you want to save the current session. 
Use "File > Exit" or "Firefox > Exit" if you want to restore multiple windows. 
You can use "Firefox > History > Restore Previous Session" to get the previous session at any time. 
There is also a "Restore Previous Session" button on the default about:home Home page. 
Firefox 4 uses a combined Stop/Reload/Go button that is positioned at the right end side of the location bar. 
During the page load process it shows as a Stop button and after the loading has finished the button is changed to a Reload button. 
If you type in the location bar then that button becomes a Go button. 
The arrow to open the tab history of the Back and Forward buttons has been removed in Firefox 4. 
Use one of these methods to open the tab history list:
* Right click on the Back or Forward button
* Hold down the left mouse button on the enabled Back or Forward button until the list opens
You can look at this extension:
* Backward Forward History Dropdown: https://addons.mozilla.org/firefox/addon/backforedrop/
* If toolbar items are missing then open the Customize window via "View > Toolbars > Customize" or via "Firefox > Options > Toolbar Layout"
* If a missing item is in the toolbar palette then drag it back from the Customize window on the toolbar
* If you do not see an item on a toolbar and in the toolbar palette then click the "Restore Default Set" button to restore the default toolbar set up.

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After today's auto download, firefox will not start, at all, any way!

after today's auto upload, Firefox will not come up, at all, no matter what I try
== This happened ==
Every time Firefox opened
== auto update ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; DigExt; GTB6.5; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

Have you tried to start Firefox in [[Safe Mode]]?
What about [[Managing profiles]]?
Try to download the latest Firefox (3.6.4) from website. I hope your settings will not be lost; possibly, it was something with network connection, and Firefox updated only one half of itself; that's why I recommend to download it from website and install manually.

I switched on my PC and there was an update for realplayer. Since then firefox will not load. It is running according to Task Manager. I've downloaded a another copy of the programme using IE but whilst it loaded as a programme, does not open a window.

I switched on my PC and there was an update for realplayer. Since then firefox will not open as a window. It is running according to Task Manager. I've downloaded a another copy of the programme using IE but whilst it loaded as a programme, does not open a window.

Hi again,
Helps if I give the correct link ! The press shift button appears to still work, but the option to start in safe mode from the programs listing of a standard install I do not think exists anymore.
Safe mode will start from a command line, (or a shortcut) and in some circumstances you may need to enter the full path name on a command or shortcut detailed instructions are at http://kb.mozillazine.org/Safe_mode
Remember (at least at this stage) do not make changes when you get the options list, just click on the continue button.
If you think that RealPlayer is causing the problem you could uninstall that for now.
Firefox recent versions are 3.6 4.0 (and 5.0 in beta). There is some debate as to whether creating new profiles or re-installing Firefox is the simplest method of troubleshooting and solving some of these problems, personally I use multiple profiles and multiple versions of Firefox, and tend to forget the required procedures are less than straightforward. For now at least try [[safe mode]] again.
* see also Instructions for [[installing a previous version of firefox]]

My itunes dosen't open. Ive downloaded it like 3 times and restarted my computer. It still dosent open the loading logo shows up then it goes away but still iTunes dosent open!

My itunes dosen't open. Ive downloaded it like 3 times and restarted my computer. It still dosent open the loading logo shows up then it goes away but still iTunes dosent open!

Anyone have any suggestions?? I've run iTunes for years now, this last update "killed" the ablity for it to run automatically on my Win7 machine. I've unloaded EVERTYTHING apple on my computer 3x times now, reloaded, as admin - even paid for cleaners to make sure. Run all the Microsoft patches, updates, everthing I could find...NOTHING seems to be working.

Firefox will not start and I get firefox.exe Application Error with the code 0x00000000, I've tried reloading but always get the same error message!

Firefox will not start, I've tried opening in safe mode, no joy. I get the firefox.exe application error 0x00000000
== This happened ==
Every time Firefox opened
== Possibly after a windows update ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; YPC 3.2.0; .NET CLR 1.1.4322; InfoPath.1)

Do a clean reinstall and 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.
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.
See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

Firefox will not start at at all. I have deleted the short cut and reinstalled. still nothing. Help!

Firefox will not start at all. I have deleted the short cut, reinstalled and restarted the computer mutliple times. Everything else on my computer works fine.
== This happened ==
Every time Firefox opened
== August 1st ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6.5; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET CLR 1.1.4322; OfficeLiveConnector.1.4; OfficeLivePatch.1.3)

See http://kb.mozillazine.org/Browser_will_not_start_up

Firefox will not start when computer is restarted.

When I shut down or restart my computer, Firefox will not start. I will click the shortcuts, but nothing happens. There is no error message and as far as I know from searching, I have no security applications prohibiting it from starting. Once I reinstall after my computer loads, it works perfectly. How can I fix this so I don't have to reinstall Firefox daily when I turn on my computer?

Hello ShirodieSchone, try to run Firefox once as Administrator (right-click: Run as Administrator).
also, if the above doesn't work, see if you can start firefox in [http://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode#os=win7&browser=fx19 safe mode] by by holding down the shift key while starting Firefox.
Otherwise try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) and see if that helps.
thank you

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.

I have a MacPro with 10.7.2 installed. I want to create a new partition and install 10.5. When I put in the install DVD and restart the computer, it does not restart. What can I do?

I just purchased a MacPro with 10.7.2 installed. I want to install 10.5 on a separate partition.
I created the partition with no issues, now when I put in the 10.5 install DVD and restart the computer, it does not restart.
All I get is a grey screen. no icons, no nothing. I have to shut the computer down.
I really need to do this. I plan on upgrading to FCP X, but I still need to finish some old projects that were done with FCP 7. I need the different boot drives

Mac Pro - Mid 2010
Processor 2 x 2.66 GHz 6-Core Intel Xeon
Memory 8 GB 1333 MHz DDR3 ECC
Graphics ATI Radeon HD 5870 1024 MB
Software Mac OS X Lion 10.7.2 (11C74)
This is a brand new machine that I just purchased from Apple. It was delivered yesterday
The old computer is an old PowerMac G5, but my OS X install disc is a retail version of 10.5.
I also tried the OS X 10.5 install disc that came with my MacBook Pro (2.6 Ghz Intel Core 2 Dual).
Same issue - nothing but a grey screen when the system tries to boot from the DVD

Firefox will not start and open a website from a Thunderbird email link. It will go to a link from Thunderbird once Firefox is open, but will not initially start Firefox and proceed to open the Thunderbird email link.

Firefox will not ''start'' and open a website from a Thunderbird email link. A link from Thunderbird will open once Firefox is ''already'' started, but will not initially start Firefox and proceed to open the Thunderbird email link.

I also have this problem. I cannot open links from a discussion board I frequent nor can I open links from my email. Also after opening my email, I cannot go to any other sites except my home page. I can then go no where else.
When I close Firefox and try to reopen it, it does nothing! I have to bring up the Task Manager and end the Firefox process before I can get back in.
To the best of my knowledge, this problem started with the new update to Ver. 3.6.9. I am running Windows XP Media Center 2005

Firefox will not start after I downloaded the newest version

Firefox used to work on my computer but will not start now that I have downloaded the newest version.

See [[Firefox will not start]]
If you issue is resolved by this post please click Solved it! so we can assist others.

Firefox will not start after computer restart

Install Firefox, runs fine. Restart computer, Firefox will not start or finally when it tries to start script errors occur. If I reinstall Firefox after a computer restart, it will work fine, again when the computer is shut down the next time it is started, will not be able to use Firefox. Firefox will not start up in Firefox safe mode, will not start in windows safe mode. Not add on's, nothing added, just the Firefox installer Performed complete system restore on the computer, same problem. Windows 7 Pro. Remove Firefox from windows control panel, restart computer, install firefox, will run. turn off computer, turn on computer, firefox will not start or freezes. I am interfacing the internet via Explorer now.
I have reinstalled Firefox so it will run in order to perform the steps requested below.

Try this
*https://support.mozilla.org/en-US/kb/firefox-wont-start-find-solutions
Open TaskManager, if it running '''firefox.exe''' > end all processes
Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
Did this fix your problems? Please report back to us!

I click on the icon and firefox will not start or try to start

I installed Avery labels and then had trouble with tool bar remover avery but now firefox will not start up when i click on icon. I removed Firefox and reinstalled but will not run.
== This happened ==
Every time Firefox opened
== 5/19/2010 ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; FunWebProducts; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; msn OptimizedIE8;ENUS)

It sounds like you may have a problem caused by an extension (maybe that avery toolbar)
[[Troubleshooting extensions and themes|Try the instructions in this article]] - begin by putting Firefox in Safe Mode. If Firefox will start in safe mode, continue with the section [[Troubleshooting extensions and themes|#Disable_all_extensions|Disable all extensions]] and then [[Troubleshooting extensions and themes|#Test_for_faulty_extensions|Test for faulty extensions]]
I hope that helps. Let us know if you can.

I just downloaded an album from itunes and 2 of the tracks will not play at all, they cut off. I need help with this??

I just downloaded an album from itunes and 2 of the tracks will not play at all, they cut off. I need help with this??

Does the track play correctly in Quicktime Player? If it does then it is an iTunes issue. If it doesn't then it is possible the file was not completely downloaded, or is corrupt.
Downloading (using iOS or computer) past purchases from the App Store, iBookstore, and iTunes Store - http://support.apple.com/kb/ht2519 - enabled with iTunes 10.3 and newer; not available in all countries; apps, books (not audiobooks), music, t.v. shows, and movies (some - not all studios have permitted this). Movies currently available in the USA only. Downloading previously purchased movies and TV shows requires iTunes 10.6 or later. Discontinued items not available. For items not included in the iCloud list (e.g., ringtones), or locations or computer systems where iCloud is not (yet?) available, you only get one download per fee paid.
If it can be downloaded again, delete the track from iTunes.
Select the store on the left side of iTunes.
Click on Purchased on the right side under Quick Links.
You can re-download your available previous purchases.
If it is corrupt and you cannot download it a second time, contact Apple. Contact iTunes Store support staff through the report a problem links in your account history or,
iTunes Customer Service Contact - http://www.apple.com/support/itunes/contact.html > Get iTunes support via Express Lane > iTunes > iTunes Store

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.

Since downloading Firefox 4.0.1 and restarting my computer, Firefox will not start.

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