Firefox 4 Totally removed 3 incl registry 4 loaded will not open

Cleaned registry Reload Firefox 4 Click on desktop icon starts to try to locate application then stops .Have also tried to run firefox direct from download site No other firefox versions in processors. OS windows 7 Had no problems with old version.updated Java

No it was a fresh install totally removed all previous versionsIcon is for new firefox4 all plugins are up todate.When I click on icon it tries to open but just drops outwith completely no change or desktop activity.Have also tried thru the programs run mode still will not open Have removed & reloaded several times firewall & antivirus turned off no different.Firefox used to run perfect on Vers 3.06
Removed old firefox entries in the registry before install of Vers 4

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Firefox works fine until after lunch. Then it will not open, unless I reboot. Am at work, & I shouldnt have to do that, NEED a fix.

Everyday its the same thing. By midafternoon, Firefox will not open unless I reboot. I am at work, and have too many things open all day to stop and reboot for a browser, when I also have IE. I prefer Firefox, it is set as my default, and have many passwords saved there that are not saved in IE. Surely there is a fix for this? I have removed it, downloaded it again, followed other suggestions from your site, but still have the same problem. If I leave a window open all day long, it will still work for me, and thats what I try to do. However, invariably, there will come that accidental second that I hit the red X at the top and totally regret it! Please help!

I had tried this before, but went ahead and tried this again.
I clicked on "reset Firefox". Firefox closed, but did not come back up. When I tried to open it again, I did receive a message that said Firefox is running but is not responding, that I couldn't open another window without stopping the processes on the other page.
I never got a window that showed me the information that was imported, or a place to click finish.
Since I don't believe this completed, I don't believe my problem will be solved.
Debra

I have firefox and after updating the other day, now it will not open at all, so I have to open the internet using the other icon thats not firefox

The icon is there but will not open at all.

Hello,
Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox program files and then reinstall Firefox. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from [https://www.mozilla.org mozilla.org] (or choose the download for your operating system and language from [https://www.mozilla.org/firefox/all/ this page]) and save the setup file to your computer.
#After the download finishes, close all Firefox windows (or open the Firefox menu [[Image:New Fx Menu]] and click the close button [[Image:Close 29]]).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#*'''Mac:''' Delete Firefox from the Applications folder.
#*'''Linux:''' If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]]. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory.
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
More information about reinstalling Firefox can be found [[Troubleshoot and diagnose Firefox problems#w_5-reinstall-firefox|here]].
WARNING: Do not use a third party uninstaller as part of this process. Doing so could permanently delete your [[Profiles|Firefox profile]] data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See [[Back up and restore information in Firefox profiles]]. 
Please report back to say if this helped you!
Thank you.

I am getting a 404 Not Found error when I try to access Yahoo Mail from Firefox. I can log in but Yahoo Mail will not open. It will open in IE. The problem is here at home.

Not Found
The requested URL /dc/launch was not found on this server.
Apache/2.2.9 (Debian) PHP/5.2.6-1+lenny9 with Suhosin-Patch Server at us.mg201.mail.yahoo.com Port 80

Hello,
'''Try Firefox Safe Mode''' to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.
''(If you're not using it, switch to the Default theme.)''
* On Windows you can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* On Mac you can open Firefox 4.0+ in Safe Mode by holding the '''option''' key while starting Firefox.
* On Linux you can open Firefox 4.0+ in Safe Mode by quitting Firefox and then going to your Terminal and running: firefox -safe-mode (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
* Or open the Help menu and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
[[Image:FirefoxSafeMode|width=520]]
''Once you get the pop-up, just select "'Start in Safe Mode"''
[[Image:Safe Mode Fx 15 - Win]]
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one. Please follow the [[Troubleshooting extensions and themes]] article for that.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
''When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.''
Thank you.

I am using the latest version of Firefox, but keep getting message to upgrade as wesite will not open as it thinkgs I am using an old version

I constantly get messages that say I am not using the latest version of Firefox & then do not display properly. I am using v3.6.3 & get this message on a lot of sites I visit.
Just noticed that in the guesses shown below -even this thinks I am using v2.0 Firefox version, which is not correct.
== URL of affected sites ==
http://www.ebookers.com/shop/home

The megaupload extension is causing that behavior:
http://support.mozilla.com/en-US/forum/1/593040?#threadId593183

With firefox 4.0 the printer friendly page of mapquest will not open.

that function of mapquest works on IE.
it also worked on firefox 3.6. so i downgraded back to 3.6.
would like to be able to use future upgrades though.
tyvm for firefox.

Does the picture uploader use Flash? You can verify that you have the latest Flash plugin for Firefox here:
http://www.adobe.com/software/flash/about/
Otherwise, I don't really have a guess as to why that function doesn't work. You could try it in Firefox's Safe Mode; if that works, it could indicate a conflict with one of your add-ons.
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, try starting Firefox in Firefox
[http://support.mozilla.com/kb/Safe+Mode Safe Mode]. Be careful not to "reset" anything permanently if you didn't back up.

I am on windows 7 and I upgraded to 10.0.2 and now it will not open. I have removed firefox completely and uploaded it again and that did not work. So my latest attempt I removed firefox 10 again and uploaded the beta version and once again nothing.

I am on windows 7 and I upgraded to the newest verison of firefox and now it will not open. I have removed firefox completely and uploaded it again and that did not work. I then made sure it could get through my firewall and that did not work. So my latest attempt I removed firefox 10 again and uploaded the beta version hoping that would do it and once again nothing. It will not open at all. Please help - is there a live chat or a number to talk to someone at Firefox?

I think when uninstalling you may also have to choose (tick) to delete the preferences and other personal data like the bookmarks, stored passwords etc. to erase completely. If you are installing afresh, please try right-clicking on the file and '''Run as administrator''' to install. And when uninstalling, please also make sure choose to delete all data and also manually delete any '''Mozilla''', '''Mozilla Firefox''' or '''Firefox''' from %appdata%, %localappdata% and %programfiles%. You can open a location by typing for eg. %appdata% in the '''Run''' box (Windows key + R). You may also have to check the '''VirtualStore''' folder in %localappdata%. Files in the VirtualStore can be problematic. I think a clean installation may help.
[https://www.mozilla.org/en-US/firefox/new/ Firefox]
[http://kb.mozillazine.org/Installation_directory Installation Folder]
[http://kb.mozillazine.org/Profile_folder Profile Folder]
Please note that using system restore would usually damage the Firefox installation.

I updated Firefox and now it will not open at all. The hourglass shows that it's working but then nothing. I went to add/remove and removed mozilla and reinstalled it and still the same thing. It worked fine before I updated.

I updated Firefox and now it will not open at all. The hourglass shows that it's working but then nothing. I went to add/remove and removed mozilla and reinstalled it and still the same thing. It worked fine before I updated. Now I can't even remove the program at all. Why is this happening?

Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
Create a new profile as a test to check if your current profile is causing the problems.
See "Basic Troubleshooting: Make a new profile":
*https://support.mozilla.com/kb/Basic+Troubleshooting#w_8-make-a-new-profile
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.
If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Firefox will not open at all. I tried to remove it from the programs to try to reinstall it but it wont let me remove it. So I tried to download again anyways and ff still wont open. My email is alicia@*****

Firefox will not open at all. I tried to remove it from the programs to try to reinstall it but it wont let me remove it. So I tried to download again anyways and ff still wont open. My email is alicia@****

Did you check your security software (firewall)?
A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox 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.
See [[Server not found]] and [[Firewalls]] and http://kb.mozillazine.org/Firewalls
If necessary then also see:
* http://kb.mozillazine.org/Browser_will_not_start_up
* http://kb.mozillazine.org/Error_loading_websites

Had a problem with hijacked browsers. Got it cleaned, Firefox will not open or un install. I want to remove existing and install a "clean" one.

Browsers were hijacked, found and quaranteened(sp?) the bugs, Mozilla will not open from the desktop, Programs. Tried to un-install either one-no joy. Want to use Firefox again, thought I could uninstall and reinstall "Clean" versions. If nothing else, since I can't use Mozilla, want to remove them permanently.

http://kb.mozillazine.org/Uninstalling_Firefox#On_Windows
Start here for manual removal instructions: 
'''Even if the uninstall fails, as it may in some cases, continue on with the rest of the uninstall instructions. '''

Firefox will not open to home page as directed in options and settings. Opening in safe mode makes no difference, either. Any ideas?

Firefox will not open to home page as set in the settings. Even in safe mode, it still will not open to home page as directed. It seems to want to open to last set of tabs, even though that is not the way it was set in settings. It seems as though the settings do not have any impact on the way it behaves!!!

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
Do a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 20.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.
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.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other profile data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

I upgraded from 3.6.13 to Beta 4.0 and now Firefox will not open at all I tried to uninstall to start again but it will not uninstall either it does nothing.

I uninstalled Beta 4 and re-installed 3.6.13 now Firefox will not open at all I tried to uninstall to start again but it will not uninstall either it does nothing, I have been using Firefox for a long time but cannot resolve this problem can anyone help and give me a solution please. As I use Firefox as my web browser it is very frustrating.
The fact it will not uninstall appears to be something completely new as nobody I know who uses Firefox has ever encountered this in the past.

Did you check your security software (firewall)?
A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox 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.
See [[Server not found]] and [[Firewalls]] and http://kb.mozillazine.org/Firewalls
If necessary then also see:
* http://kb.mozillazine.org/Browser_will_not_start_up
* http://kb.mozillazine.org/Error_loading_websites

Firefox will not open. Hangs at "connecting" stage. Non-responsive even to process shut-down via task manager.

Starting yesterday, Firefox will not open at all. It hangs at the "connecting stage." For hours. It will not shut down even using the task manager for applications or processes, and it locks up virtually every other application. I thought I managed to save an open Word document yesterday - it looked like a slow, but normal save during the Firefox hang, but the document was empty when I restarted my computer.
Even though my machine is not pentium 4 based, I tried starting using the Windows XP/M configuration, I downloaded and re-installed (over the top of) the existing version, I verified that no Mozilla processes were running before trying to start Mozilla, and tried creating a new profile. Absolutely no success. Every time (of the dozens) I have tried to start Firefox I have had to force a hard shut-down to get out of the application. I have now unpinned Firefox from my task bar because I keep forgetting and hitting it by reflex.
I am running version 11.0 (at least that is what I just downloaded - I am not positive what I was running yesterday). My system is Windows 7 Home Premium, Intel Core i3, 2.4 gHz, 4 GB RAM, 64 bit OS.
Next option is to restore to a previous version. If that doesn't work, I will uninstall and start over from scratch.

A possible cause is security software (firewall) 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
*http://kb.mozillazine.org/Browser_will_not_start_up

Firefox will not open after i use it 3 or 4 times i have to update to make it work ?

Using XP pro after a couple years firefox quit working. will not open, went to support tried everything including a clean install. after which it worked for a short while then won't open. click on icon nothing happens. downloaded 18.0 update and installed worked a few times then quit. created new profile but when i click on firefox does not do any thing. if i run the update installer it will work for a while then quit to make it work again i have to update again ant it will work mabey for 1/2 to 1 day. after i update when firefox opens then it will give me the profile box. after it quits it will not load the profile box until i update again.

Which security software (firewall, anti-virus) do you have?
Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.
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

Firefox will not open intermittently - it opens once, then will not open the next several times I try to use it - no discernable pattern or event(s) triggering failure to open

Firefox opened today at 5 pm. I closed it when finished, then tried to reopen it about 6 pm - it will not open. I have tried several times in the last hour and it will not open.
When I attempt to open Firefox, the 'busy' circle spins for several seconds, but then it stops, but Firefox NEVER opens and I get NO ERROR MESSAGE so I have no clue as to what the problem is.
I have a Dell PC, running Microsoft Windows Vista, 32 bit (I think). AS far as I know, there were no updates of any kind that preceded the Firefox problems, which started about one week to 10 days ago.
I have re-downloaded the program; I have uninstalled and then redownloaded the program to no avail. I can not figure out any kind of pattern, although it does seem to be more likely to open in the a.m. hours - but not always.
I really prefer Firefox as my default browser, but I will not continue to use it on such an intermittant basis. Please help me trouble shoot this issue. By the way, I have had no problems, when Firefox won't open, opeing IE or Chrome, so I know it is not a generalized internet access issue.
Please help.
29Aug2011, Kay Arnold

Which security software (firewall, anti-virus) do you have?
Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.
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

Firefox 4 Totally removed 3 incl registry 4 loaded will not open

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