Firefox does not start, nor can it be uninstalled

Similar Questions

• Firefox does not start - claims that it is already open

  Firefox does not start. He claims to be already running, but that doesn't seem to be the case.

  I tried to create a new user profile, but when I try to open Firefox now, the menu "choose user profile". I tried the new profile and they old, and both give the same error message. "Firefox is unable to use the"Default user"profile because it is in use. To continue, close the Runspace of Firefox or choose a different profile. »

  There is an entry for firefox.exe in the menu of "details" to my task manager and nowhere else. When I try to put an end to this task, I get the following error: "the operation could not be performed - access denied."

  Due to some troubleshooting research, I tried to delete the parent.lock my profile folder, but I get this error: "the action cannot be completed because the file is opened in Firefox."

  I tried to transfer my bookmarks and preferences from Firefox to Chrome, but I had a similar error suggesting that Firefox was already open and I have to close first.

  I also turned off my computer and uninstalled and reinstalled Firefox several times.

  I'd really rather not lose all my bookmarks Firefox, modules, and preferences. I also prefer to use Firefox for Chrome, so if anyone can help me I would really appreciate it. I don't know what else to try.

  My PC runs Windows 10, incidentally.

  Try to delete the parent.lock file in the Firefox profile folder.

  • C:\Users\ < user > < profile > \AppData\Roaming\Mozilla\Firefox\Profiles\.
  • http://KB.mozillazine.org/Profile_folder_-_Firefox

  See:

  • http://KB.mozillazine.org/Profile_in_use
  • https://support.Mozilla.org/KB/Firefox+is+already+running+but+is+not+responding

  What security software do you have?

  Try to create a new shortcut on the desktop Firefox and maybe to reinstall Firefox via a clean reinstall (i.e. remove the Firefox program folder).

  If you cannot remove the Firefox program folder and then try to rename this file to "Mozilla Firefox.old".

  • (Windows 64 bit) "C:\Program Files (x 86) \Mozilla.
  • (32-bit Windows) "C:\Program Files\Mozilla Firefox\"

  Start the computer in Mode safe mode with network support Windows (on the startup screen, press F8) to see if that helps.

  • http://www.bleepingcomputer.com/tutorials/how-to-start-Windows-in-safe-mode/
  • http://www.7tutorials.com/4-ways-boot-safe-mode-Windows-10

• Firefox does not start "XPCOM" message pop up, my user and passwords! ??

  My window 7 was not starting up properly so I did a system restore and now firefox does not start a message appears indicating "XPCOM" and I googled and all is said to reinstall Firefox. I don't usually to reinstall immediately because I need my passwords and username back. I can't find a solution on the forums, or if there is I have not found or I simply did not understand the solution itself. Please get back to me as soon as possible

  Thank you!

  Is a restoration of the system to a cancellation of the recent updates or something more radical?

  You can do the following type of reinstall without touching your settings files. Important: uninstall NO Firefox first. That is not necessary.

  Clean reinstall it

  (1) download a fresh Installer for Firefox 36 of https://www.mozilla.org/firefox/all/ in an ideal location. (Scroll down your preferred language).

  (2) the release of Firefox.

  (3) to rename the program folder

  (Windows 64-bit folder names)

  C:\Program Files (x86)\Mozilla Firefox
  

  TO

  C:\Program Files (x86)\OldFirefox
  

  (Windows 32-bit folder names)

  C:\Program Files\Mozilla Firefox
  

  TO

  C:\Program Files\OldFirefox
  

  (4) run the installer you downloaded in the #1. It should automatically connect to your existing settings.

  When you start Firefox, you may need to use the Profile Manager to return to your regular profile. Ignore: copy/paste glitch.

  Any improvement?

  Note: Some plugins can only exist in this OldFirefox file. If it is missing something essential, present in these files:

  • \OldFirefox\Plugins
  • \OldFirefox\browser\plugins

• Firefox does not start (not safe mode), but uses the CPU

  I have the latest Firefox 25.0 (and the last Flash 11.9.900.117) on Windows 7 and the following behavior is reproducible. It started not too long ago.

  At first when I launch Firefox, nothing appears no matter how often, I restart. I see in the list of the process firefox.exe to 25% of the CPU, 2 x FlashPlayerPlugin_11_9_900_117.exe (CPU 0%) and plugincontainer.exe. No matter how many times I killed all of them, would not restart Firefox.

  The following also not help in this situation:

  • Starting in normal safe mode: Firefox opens a window but immediately freezes and does not respond. The process list shows the same process even if I find the unexpected FlashPlayer.
  • Disable plugincontainer: same results (just without plugincontainer.exe)
  • Uninstall Flash: Same results (just without FlashPlayerPlugin)

  The following can start Firefox only once:

  • Starting in SafeMode but select "Reset Firefox": Firefox does not start right away, however. Nothing happens, and you have to kill the process. However the very next time you launch Firefox in the normal way, it works fine (but it shows FlashPlayerPlugin.exe in the list of unopened Windows process despite the tab). Unfortunately, after closing Firefox the process (Firefox, FlashPlayerPlugin) are not deleted. I kill and the problem with Firefox do not leave reappears.

  In case you use "clear history of Firefox closing:

  • do not delete Cookies

  Note that compensation "Preferences of Site" clears all exceptions for cookies, images, windows pop up, installation of software and passwords.

  Use "Firefox > output" (Windows: Firefox/file > quit;) Mac: Firefox > quit Firefox. Linux: Firefox/file > exit) to close Firefox if you are currently doing by clicking on the X close in the title bar of Firefox.

  Create a new profile manually (and not via the reset) as a test to see if your profile is the source of the problems.

  See "create 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 files from a profile in the new profile, but be careful not to copy files corrupted to avoid transporting on the problem.

  • http://KB.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

• Firefox does not start. Error oxc0150004

  Firefox will not start. I uninstalled and reinstall.
  Nothing has changed. I have used Firefox for years. This first
  time, I have a problem.

  Hey Horrie.

  Have you tried to start Firefox in Mode safe? Key 'shift' startup of Firefox. If the accident is not in Mode without failure, you should read the extensions, themes and problems of hardware acceleration to resolve common troubleshooting Firefox problems.

  There are also a lot of useful things in the article Knowledge Base of Firefox does not start . If you have recently upgraded, you can check out this article as well.

  Hope this helps!

• Firefox does not start because he says that it's another instance that runs in the background, but I checked and it is not a!

  Firefox does not start because he says that it's another instance that runs in the background, but I checked and it is not a! I have Linux Fedora 15 and I'm not the root. I spoke to the Manager and he said I should delete a file in the folder where firefox is installed and which can solve the problem. Can you help me?

  Thanks, Marius
  

  Upgrade your browser Firefox 8 and check

  • getfirefox.com

• Mozilla Firefox does not start

  My Firefox does not start. I've tried the upgrade, the problem still persists. The icon is there, but nothing happens when I press it.

  Hi Dick3974,
  Please reinstall Firefox for Android from Google game store and see if this problem persists.

  We look forward to your response.

• Firefox does not start after the computer restarts

  Install Firefox, works great. Restart the computer, Firefox does not start, or finally when it tries to start the script errors occur. If I reinstall Firefox after restart of a computer, it works fine, once again when the computer is stopped at the next startup it is, will not be able to use Firefox. Firefox does not start in Firefox Safe mode, does not start in windows safe mode. Do not add now, nothing has been added, just the Firefox installer played complete the system restore on the computer, same problem. Windows 7 Pro. Remove Firefox from windows control panel, restart your computer, install firefox, will take place. shut down the computer, put on the computer, firefox does not start, or crashes. I am exploring now Web interface.

  I reinstalled Firefox, so it will run in order to perform the steps below.

  Here is the answer which took care of the problem,

  http://KB.mozillazine.org/Browser_will_not_start_up#Problematic_plugin_prevents_browser_from_starting

  "Site Web TrueSuite Log On" plugin (AuthenTec), is the question.

• After that restart of firefox does not start. is running in the Task Manager, but won't pop up. Reset safe mode and uninstall/reinstall won't help. OK so no reset.

  Win7 Pro. has worked ok firefox. but lately with 25 and 26 now, firefox does not start. I see that firefox is running in the Task Manager. but it will not just appear.
  If I still download and install it, it runs, but every time I restarted the system, it just does not work yet.
  Reset try:, safe mode, uninstall & reinstall, new/clean profile none of these work.

  
  

• On another PC I want to save my favorites, but my browser Firefox does not work how can I make the backup, before I reinstall Firefox

  On another PC I want to save my favorites, but my browser Firefox does not work how can I make the backup, before I reinstall Firefox.
  Firefox cannot renew its tabs and now won't run and let me do a backup

  This may be considered to be solve my problem.
  I decided to uninstall the rogue program Firefox download and reinstall the same version (No. 8). I used Windows XP Add Remove programs who asked if I wanted to save the settings of Firefox until I uninstalled Firefox. I said yes and operated with the uninstall. I couldn't find a Firefox 8 so I went for the 12 version and installed on the laptop. This version 12 now works with all the passwords one favorite of the uninstalled 8.
  Thank you for all your help and advice.

• 9.01 Firefox does not start, has a dialog box saying: it is still ongoing.

  Does anyone have ideas with the following Firefox Vista problem.

  9.01 Firefox does not start, has a dialog box saying: it is still ongoing.

  There is no instance of firefox in the Task Manager.
  I uninstalled firefox and reinstalled both of
  Desktop mode and course in vista.

  I have deleted all instances of firewall.

  I tried with firewall failure

  Still having the same problem

  Solved by uninstalling all the firefox - including my settings

• I get this error message and Firefox does not start... EXC in ev handl: error: error definition property on NPObject!

  Firefox does not start and this message keeps coming back... I uninstalled and reinstalled... but nothing helped...

  EXC in ev handl: error: error definition property on NPObject!

  Disable the extension "McAfee Site Advisor" who has just updated 3.4.0 that probably out of block of addons list.

  • 'Ctrl + Shift + A' > find McAfee Site Advisor and use 'Disable', and then restart Firefox.
  • Do a Google search without problem
  • It seems that if you re - enable new Site Advisor and restart Firefox you agree. At least you know where to look if you get the error again, or research on Google to slow down.

• Windows xp does not start, I can't even in safe mode. I Mindprint just a black screen with the mouse arrow. What can I do

  Windows xp does not start, I can't even in safe mode. I just get a black screen with the mouse arrow. What can I do

  Hello

  1 did you changes to the computer before the show?

  You can try the troubleshooting provided in the link below steps to fix the problem.

  Computer stops responding with a black screen when you start Windows XP

  http://support.Microsoft.com/kb/314503

• Windows xp does not start, I can't even in safe mode. I just get a black screen with the mouse arrow. What can I do

  Windows xp does not start, I can't even in safe mode. I just get a black screen with the mouse arrow. What can I do

  You have all the features non-essential related to the machine?
  Have you installed a new hardware or software recently?

  Try to do a repair install and see if it corrects the problem.

  How to perform a Windows XP repair install

• Windows XP does not start. Can I boot Windows from a disk so that I can recover the data?

  Windows XP does not start. Can I boot Windows from a disk so that I can recover the data? This should be a CD because it doesn't have a floppy disk on my laptop drive. It is maybe that my hard drive has begun to fail and therefore cannot locate XP startup files. I can not start using one of the other methods of starting for example. Safe mode. If I can recover the data, I can then reload Windows and check the surface of the disc etc etc. Thank you all for your comments. Steve

  Lately, I'm leaning toward the Hiren's BootCD you can download here:

  http://www.hirensbootcd.NET/

  On the left, click on download, scroll down, choose the most recent version

  The download link is a little hard to see.  It is at the bottom of the page, above the drop for older versions and looks like this (click this component to download the ZIP file):

  Direct HTTP mirror + Torrent, Torrent Magnet

  Click the "Live HTTP Mirror" link to start the download and save the ZIP file on your desktop of somewhere that you can remember.

  The ZIP file is large, so the download will take probably some time to complete.  Then unzip the download to extract theHirens.BootCD.ISO file that will be used to create your new bootable CD.

  Create a bootable CD. ISO file is not the same as simply copying the. File ISO onto a blank CD.  You must use software that includes how to burn a. ISO to a CD to create a bootable CD.

  File ZIP the Hiren is the file BurnToCD.cmd that you can double-click to launch it.  The BurnToCD.cmd will use the file BurnCDCC.exe to burn the. ISO file onto a blank CD using your existing CD burner.  You can also use your own burning software as long as your software is able to create a bootable CD. ISO file.  More modern burning programs can create a bootable CD. ISO image.  Create a CD from an ISO image bootable is not the same as just the file on a CD burning.

  If you need a simple and CD burning, this is a free software popular software:

  http://www.ImgBurn.com/

  Here are some instructions for ImgBurn:

  http://Forum.ImgBurn.com/index.php?showtopic=61

  It would be a good idea to test your new bootable CD on a computer running.

  You may need to adjust the computer BIOS settings to use the CD-ROM drive as the first device to boot instead of the hard drive.
  These adjustments are made before Windows tries to load.  If you miss it, you will need to restart the system again.

  When starting on the Hiren's CD, you will see a menu of options.  Choose Mini XP.

  It will appear while Windows is loading and you will be presented with a desktop computer that has the look and feel of the interface of Windows Explorer, you are already accustomed to using.  You will feel at home.

  Using the Mini XP, you can access the Internet, maneuver around your system, copy files, replace the files, run the scans for malware, etc.  There are dozens of free and useful tools included in the CD that can be used to repair your system, or copy files to another device such as a USB device or an external drive if drop in trying to repair your system.

  If you want to see if you can fix your system, describe what is happening when you try to start and to answer these questions:

  What is your system brand and model?

  What is your Version of XP and the Service Pack?

  Describe your current antivirus and software anti malware situation: McAfee, Norton, Spybot, AVG, Avira!, Defender, ZoneAlarm, PC Tools, MSE, Comodo, etc..

  You have a true bootable XP installation CD (it is not the same as any recovery CD provided with your system)?