Updated to 4.0 version and when it loaded I got 4 identical icons on my desktop. I went back in time on my computer and now Firefox won't open.

Updated to 4.0 version and when it finished loading I got 4 identical Firefox icons on my desktop. I went back in time on my computer to go back to an order version and Firefox won't open or is very slow to open.

Do a clean (re-)install:
* Download a fresh Firefox copy and save the file to the desktop.
* Firefox 4.0: http://www.mozilla.com/firefox/all.html
* Firefox 3.6.x: http://www.mozilla.com/en-US/firefox/all-older.html
* 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.
* It may not be necessary to create a new profile, so first try if it works with your current profile and if not then create a new profile.
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.
* http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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I changed my setting to private browsing and now firefox won't open. Any ideas?

I changed my setting to private browsing and now firefox won't open. Any ideas?

In what way did it not open? Was the Firefox icon on the task bar?
Did you get any error messages? Did the computer show Firefox
as running?

Help! After this morning's update installed, an error message appeared that read: "XUL Runner. Platform version '6.0.2 is not compatible with miniVersion =6.0.1 maxVersion =6.0.1" Now Firefox won't open or respond at all. What's the fix?

Error dialogue box appeared:
XUL Runner. Platform version '6.0.2 is not compatible with miniVersion>=6.0.1
maxVersion<=6.0.1
This happened a few minutes ago when I clicked on the Mozilla icon.

If you use ZoneAlarm Extreme Security then try to disable Virtualization and do a clean reinstall.
* http://kb.mozillazine.org/Browser_will_not_start_up#XULRunner_error_after_an_update
See also:
*[[/questions/869812]]
*[[/questions/869951]]

Downloaded latest version and now firefox won't open "mozjs.dll not found"?

I downloaded version of firefox (5.0?), and when the computer restarted firefox won't open. I get a "mozjs.dll not found".
Help?

'''''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''''' {web link}
While you are in safe mode;
Press the '''<Alt>''' or '''<F10>''' key to bring up the tool bar.
Followed by;
Windows; '''Tools > Options'''
Linux; '''Edit > Preferences'''
Mac; ''application name'' '''> Preferences'''
Then '''Advanced > General.'''
Look for and turn off '''Use Hardware Acceleration'''.
Poke around safe web sites and see if there is still a problem. Then restart.

Tried to use Restore to return to pre-Firefox4 but now Firefox won't open and won't uninstall.

After trying to maneuver the new Firefox 4.0 for a while and giving up, I wanted to go back to the 3.6.1.6 version. I used the Restore feature to try to go back to the pre-Firefox 4.0 dowload. Since then, Firefox won't open. I have tried to uninstall Firefox 3.6.1.6, which is listed in my installed programs in the Control Panel, but it doesn't do anything. At this point I don't know what to do. I want to re-instate the 3.6.1.6 version on my computer. Thanks.

You're in a bit of a pickle here because you can't use System Restore to revert to 3.6.16. You probably now have version 1.9.2.x which is in part, files which were not removed when you installed FF4
What you can try and do is use System Resore to undo the last restoration which should take you back to 4.0 again. If that fails, see this article: http://kb.mozillazine.org/Uninstalling_firefox
If the undo restoration is successful, do the following to revert to 3.6.16
Go to [http://www.mozilla.com/en-US/firefox/all-older.html Download Firefox v3.6.16] and download it to the desktop. If necessary, download the file with IE8 and choose to save it to your desktop when you see the prompt.
Then go to Add/Remove Programs, scroll down to Mozilla Firefox and remove it, choosing to keep your bookmarks, customizations etc., (don't checkmark the box).
Then reboot and delete the folder called '''Mozilla Firefox''' at this location: ''C:\Program Files\Mozilla Firefox''
Finally run the installation file you downloaded to the desktop earlier.
Your bookmarks, customizations etc., are maintained in a different location and will become available to you again once you complete the installation.

Hate 4, Tried system restore to get version 3 back, now firefox won't open

After upgrading to ver. 4 I had to start using I.E. to use court report sites and county tax sites, and had other problems so I need to revert to ver.3
I did a system restore and now Firefox will not open. (vista home premium)

Here's the process to reinstall Firefox 3.6:
You can download an installer for Firefox 3.6 from http://www.mozilla.com/firefox/all-older
Before running it 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] (copy whole profile folder).
Close Firefox 4, and uninstall it. Do not remove your personal data and settings, just the program. Some people report it's okay to skip this step.
Then finally you can reinstall Firefox 3.6. Unless you have installed an incompatible add-on, it should pick up where you left off. If there are serious issues, please post back with details.
Note: I haven't actually tried this myself!
Finally, just a note that System Restore may have changed the registry settings from Firefox 4 to Firefox 3.6, but doesn't actually change the program files, so that could be why it's broken.

I downloaded a Firefox security update and now Firefox won't open. From what I can understand my firewall is most likely blocking Firefox now as it doesn't trust it. I have NO idea what to do next, what firewall I am using or even how to find out. HELP!

I have a MAC. If you can help me please be detailed and patient... I don't know what I am doing!

Tina,
I would go crazy if this was me. You may find this interesting from the customer agreement (to see full agreement go here:Customer Agreement | Verizon Wireless):
"HOW AND WHEN CAN I DISPUTE CHARGES?
If you're a Postpay customer, you can dispute your bill within 180 days of receiving it, but unless otherwise provided by law or unless you're disputing charges because your wireless device was lost or stolen, you still have to pay all charges until the dispute is resolved. If you're a Prepaid customer, you can dispute a charge within 180 days of the date the disputed charge was incurred. YOU MAY CALL US TO DISPUTE CHARGES ON YOUR BILL OR ANY SERVICE(S) FOR WHICH YOU WERE BILLED, BUT IF YOU WISH TO PRESERVE YOUR RIGHT TO BRING AN ARBITRATION OR SMALL CLAIMS CASE REGARDING SUCH DISPUTE, YOU MUST WRITE TO US AT THE CUSTOMER SERVICE ADDRESS ON YOUR BILL, OR SEND US A COMPLETED NOTICE OF DISPUTE FORM (AVAILABLE AT VERIZONWIRELESS.COM), WITHIN THE 180–DAY PERIOD MENTIONED ABOVE. IF YOU DO NOT NOTIFY US IN WRITING OF SUCH DISPUTE WITHIN THE 180-DAY PERIOD, YOU WILL HAVE WAIVED YOUR RIGHT TO DISPUTE THE BILL OR SUCH SERVICE(S) AND TO BRING AN ARBITRATION OR SMALL CLAIMS CASE REGARDING ANY SUCH DISPUTE."
This may help you also: Arbitration and Mediation FAQs | Verizon Wireless
You can dispute any charges by doing an Arbitration or Mediation. I have never done it, so I can not help much there but this all may get you started.
Let me know if any of this works! Good Luck! Please keep me updated. I really hope they help you.

I downloaded a new version of iTunes and now Firefox won't open iTunes

I loaded new version of iTunes and Safari. When system restarted - iTunes won't open. I deleted Safari - still no go.

I'm having this issue as well. Anytime I click on items that would normally open in Itunes, it tells me I need to install Itunes. I've uninstalled/reinstalled Itunes to no avail. In looking in Firefox's preferences, there's no reference to Itunes in the Applications tab.

Firefox 4 could not be made to show bookmarks on Vista 64bit. I used system restore to get back to older version. Now Firefox won't open at all even after undoing system restore

I use Vista 64 bit. Was fine with older Version of Firefox (3.6, I believe). Upgraded to Ver. 4. Couldn't access extensive bookmarks file or bookmarks toolbar. Tried all the Firefox help recs and they didn't work. Clicking the top button would give list of toolbars but when I tried to move to bookmarks toolbar the menu changed. Tried going thru tools and options and that didn't work. So decided to use System Restore to get old Firefox version back. Icons remained but program wouldn't open. Tried many ways, including start menu. Old version is still on program control file but only option is to uninstall. So went back to System Restore to get Vers. 4 back and it's not there. What to do?? I can use Google Chrome or Internet Explorer but I want all my 100's of bookmarks back. Thank you.

'''''<u>Users are overusing and misusing System Restore!</u>'''''
System Restore:
#is a way of protecting the '''''Windows environment'''''
#'''''may help to avoid a complete reinstall of the Windows Operating System'''''.
# should '''''never be used in place of un-installing an application and trying to replace it with an earlier version of that same application'''''
#'''''should generally be the LAST step in diagnosing/reversing a problem with the operation of Windows, BEFORE performing a complete reinstall of the Windows Operating System'''''
See this and related articles on the Microsoft site: http://support.microsoft.com/kb/959063

I just did two System Restores (and clicked something that asked me about "[something -exe]," and now Firefox won't open at all.

I hope someone can help. My husband did something to update Firefox (or Firefox just automatically updated today, I don't know which), but I didn't like the new toolbar much, so I did a System Restore to get back the old one. That didn't work, so I then did another System Restore for an earlier day, but when I restarted the computer, Firefox wouldn't open at all.
A pop-up asked me something about "allowing 'something-.exe' at start-up," with options like "Remember this action, don't allow, and allow," I think, and I don't remember what I clicked, and that's likely part of the problem, but in any case, I can't get Firefox to start now. I click on the logo/icon and nothing happens.
I tried to undo both System Restores, but the computer would only restore the most recent one, not both.
And I tried, as suggested on the forum elsewhere, to go into "Firefox Safe Mode," but that didn't help either.
Thank you for any help.

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.

I trashed my mimetypes.rdf file to reset download actions, and now Firefox won't open because profile missing, please advise

Up until recently, when I would download a pdf file, it would automatically open, and recently, for some reason, it stopped opening automatically and just downloaded to my desktop where I wanted it. I found instructions on Mozilla if files downloaded but not displayed, that included displaying my profile folder and then deleting it. I trashed it (different from deleting?) and now if I try to open Firefox, I get the message that Firefox can't open/load because profile is missing. Please advise how I can get the profile folder back in.
thanks

Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Interrupted while setting about:config. Came back and now firefox won't open for more than 1 second.

As above. looked up and was late to work. never 'closed' file or settings.
Came back from work and now firefox opens for about 1 second and automatically closed
down immediately. I've removed it. uninstalled it. redownloaded it. still does same.
Now I can't go back in and recheck the config settings, because it won't stay open long enough
to even work on it.
I had remotely saved my bookmarks, so that's the most valuable thing.
I'd be happy to wipe it off my disc and simply replace it and start all over.
How can i get that done? I'm not a super pro, so direct steps would be really useful.

You can try to delete the prefs.js file in the Firefox profile folder.
*/Users/<user>/Library/Application Support/Firefox/Profiles/<profile>/
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Preferences_not_saved

All the sudden I get a runtime C++ error saying it stops abruptly and now firefox won't open

It was working fine then yesterday every time I tried to open firefox I got an erroe message saying abnormal termination. A runtime C++ library error. I removed firefox today and downloaded it again but still have the same problem.

Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Just had Javascript update done and now Firefox won't open,,,keeps coming up with XML Parsing error not well formed. how can I get rid of this?

also awindow pops up NS error XPC Bad convert JS cannot convert JAVASCRIPT argument arg 4 (NSL window watcher open window)
== This happened ==
Every time Firefox opened
== just today ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; (R1 1.5))

There's a lot there, so I'll start with the parts I can answer quickly.
The "ACL found but not expected..." messages can be safely ignored, so says this article
http://docs.info.apple.com/article.html?artnum=306925
(look below all the "SUID" examples)
I had changed my Desktop image earlier but when the "Installing 1 item" window came up it changed back to the back ground that you first see on your desktop after installation.
Leopard installs updates a bit differently. If it's simply an application that does not change system files, it installs them like before, without having to restart. If the update is to the system, then you must immediately "restart," It then goes to that stars and purple screen to perform the installation. Before, it would do the installation while you still had control of the Mac and would prompt you to restart when it finished the installation. This change probably make things more secure and reliable, because you aren't allowed to do other things on the Mac while system updates are being installed.
Please post back with the remaining point of concern.

I downloaded version 4 this morning and now Firefox won't open. I use XP. It is going in taskmgr but not opening up.

I have tried everything to get the new 4.0 to open. I did the upgrade this morning and have been working on it all day, When I tried installing it several times FF was running so I closed it down via task mgr. I rebooted.. did everything I could think of. I really don't want to uninstall and lose all my info and settings, along with my add ons. I am defragging now, hoping that might help. I am using Windows XP.

When I downloaded new stupid version causing crash my system My Norton gone
after 4 h struggling finally I got it back but only protection I lost my identity safe data witch is very important for me my password can not be verify and I can not fix it I'm so mad I want old version back

Updated to 4.0 version and when it loaded I got 4 identical icons on my desktop. I went back in time on my computer and now Firefox won't open.

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