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?

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I just updated to 3.6.11 and now firefox won't load any web page

I just updated to 3.6.11 and now firefox won't load any webpage it
just times out I tried diableing add-ons no difference. I't on internet exploers now. Tried rebooting.

Do you use McAfee Antivirus/Firewall/Security products? McAfee released a security update that is blocking Firefox 3.6.11. This should be cleared up with the next McAfee update.

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

I downloaded an app called 'Cinema but instead of promised movies got trailers. Then I deleted it etc A dvised on help page and now it won't reinstall any ideas? Have contacted itunes x 2 but no response and unable to contact app developers.

I bought an app from itunes called 'Cinema' It promised loads of movies but all I got was trailers. No way to contact the developers of the app. So I followed the 'Support' advice and deleted etc and now it won't reinstall. there is no install button next to it!. It was only £6.99 so not a fortune but I'm wary of trying any others now. Where did I go wrong and how do I put it right?

Yeah, I know I can restore it, but I might as well go ahead and try. I just finished a backup for icloud and itunes to make sure, I'll go ahead and restore it and set it up as new and see how that works. Seems like I have no other options at this point, I'd still like to know what they did with the Download tab in itunes store, if they removed it or if I'm just overlooking it.

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.

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

Updated to android 2.3 on my htc evo 4g and now firefox will not open any tabs?

I've been using Firefox 4 since first few weeks of release and all was great with Android 2.2 on my htc evo 4g. Now updated to 2.3 this past weekend and Firefox will not open any tabs. Have resorted to using stock Dolphin... :(
I miss Firefox. What is the fix?

If you use ZoneAlarm Extreme Security then try to disable Virtualization.
*http://kb.mozillazine.org/Browser_will_not_start_up#XULRunner_error_after_an_update
See also:
*[[/questions/880050]]

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.

Help please! Updated OSX to 10.9.3 and now Firefox won't open

When I click on my Firefox icon now, it brings up the window to choose safe mode or reset. It won't do anything in either.
I have re-started many times. I have shut down and restarted. Nothing is working!
I have no menu bar, no availability to pull down from Help or anything. Just the spinning wheel.
Yikes! Firefox is my default browser and I have many tabs and open windows I would love to access.
PS I am not a computer consultant

Make sure there's only one copy of Firefox in your Applications folder
When I click on my Firefox icon now
You are referring to the Firefox icon in your Dock, not your Desktop, correct?

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

Updated iTunes to the newest version and now iTunes won't open any more.

Yesterday, iTunes was working properly. Ran spy sweeper and PC has no viruses. Opened iTunes today and it asked if I wanted to update to the newest version. I did. Newest version never installed properly. Said a file was missing 2/3 through with installation. Tried to uninstall and reinstall completely and its telling this same file is missing. Any ideas? Using Windows 7. Trying to connect with my iPhone 5.

The error message I am receiving is:
iTunes.exe - System error.
The programs can't start because MSVCR80.dll is missing from your computer.
Try reinstalling the program to fix this problem.
(Which I have done.)
Next error message is:
iTunes was not installed correctly. Please reinstall iTunes. Error 7 (windows error 126)

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.

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

I accidently changed my DAE setting in Logic pro and now it won't open. Any ideas?

Help...

start Logic, immediately press ctrl key. Say "No" to starting coreaudio. Correct your setting, quit Logic, restart Logic.

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

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