Firefox 4 upgrade failed, will not open or let me uninstall it without a computer restart message

I tried to update my Firefox to version 4 last night. When it was complete, it asked me to restart my computer.
After restarting the computer multiple times, I am continuing to get the message when trying to open Firefox.
I also cannot uninstall Firefox using the "Add/Remove Programs" in Windows without the message appearing, nor can I run the installation program again.
No matter what I do -- whether that is restart the computer, try to install the software package again, or uninstall it and start over -- I get this message:
"Your computer must be restarted to complete a previous upgrade of Firefox. Do you want to reboot now?"
I am on a Windows XP machine.

hey i had the same problem got it fixed so if someone has this problem. download "unlocker" here : [http://www.filehippo.com/download_unlocker/ link text] go to the directory where firefox is installed (C:\Program Files\Mozilla Firefox) use unlocker to delete the folder by right clicking on the folder and selecting unlocker then use the delete action. after that you can just install firefox with no problem. and yes all your bookmarks and everything wil still be there since this is not saved in this directory

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I have used Firefox on my computer for several years. Today, after upgrading to the new version, I was not able to open Firefox. I have tried several times uninstalling and re-downloading Firefox. It still will not open! What is wrong?

I have used Firefox on my computer for several years. Today, after upgrading to the new version, I was not able to open Firefox. I have tried several times uninstalling and re-downloading Firefox. It still will not open! Is the new version not compatible with Windows Vista?

I hope that link points to mozilla.com or mozilla.org
You will have to close firefox.exe with the Windows Task Manager from the "Processes" tab of the WTM since you don't have a widow to close.
The best way to close Firefox is through File > Exit, for those who stuck with the "Firefox" button click on the Firefox button then Exit. It is not perfect but it is a lot better than just closing the window with the "X" in the upper right corner

After installing updated firefox,my speed dial will not open when I close the current tab which it did before I upgraded

after installing updated firefox,my speed dial will not open when I close the current tab which it did before I upgraded. How do I fix this problem? Thank You, Mike Chidester

is it up to date
Speed Dial :: Add-ons for Firefox
"Works with:
Mobile 0.7 - 1.0.*
SeaMonkey 2.0 - 2.5a1
Firefox 2.0 - 8.0a1"
https://addons.mozilla.org/firefox/addon/speed-dial/#detail-relnotes

Firefox 7 and 8 will not open, I have to revert back to 4 to get it to start

Everytime firefox upgrades it will not open. No error, just no response. this happened on all updates to 7 and now 8. Each time I have to reload 4. The only advice I found was to somehow set the antivirus. I had McAfee. I completely removed it, but no joy. I now run Symantic Endpoint Protection, but it still doesn't matter. I have a Dell D610 running XP Pro 5.1.2600

https://forums.adobe.com/message/6219922#6219922
See if the issue in the thread above helps you to solve your problem.

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

After updating to Firefox 4 the browser will not open

I updated to the new firefox 4. Since then the browser will not open. I tried uninstalling it and reinstalling but this has not resolved the issue.

I couldn't get it to start at first. Then I found a forum that hade other issues with plugin and firefox 4 where the solution was to start firefox 4 in 32 bit mode and not in 64bit mode. After that it works nice for me.
It might also be useful to change the setting for the time that scripts are allowed to run.
dom.max_script_run_time should be set to higher number than 80 according to the support.
Good luck!

After updating my iPad to ios7 my kindle cloud reader will not open. I've uninstalled and reinstalled the app and it still won't open.

After updating my iPad 2 to ios7, my kindle cloud reader will not open. I've uninstalled and reinstalled the app but it still won't open.

I am experiencing the same thing. My Kindle cloud reader (icon/shortcut placed on my iPad screen) was working fine before I updated to ios7. I can go to Amazon's website and directly log into the cloud reader and it works fine, but when I make a copy/shortcut onto my iPad's screen (from Safari), and try to login, the login screen just sits there doing nothing. I can even put in a false username and password, hit enter, and the login screen just sits there. Knowing that Apple has made life as difficult as it can for Amazon/Kindle ( demanding outrageous fees for user to purchase books directly through the Kindle app), I wonder if the ios7 was designed to give kindle cloud readers trouble. Note, you could always login to the cloud reader directly from the amazon site, purchase the books, then use the actual kindle reader ( where thanks to Apple you can't purchase books) to read the books.

Firefox 5.0.1 will not open, I just upgraded to it.

Firefox will not open. I have been to the task manager over and over and stopped the already running firefox, no help. I just upgraded to the new 5.x.x, and now it will not open ever.

You may need to delete the Firefox program folder before (re)installing the latest Firefox. 
In case you still have problems after installing then check your security software.
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 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 4.0 will not open at all. It shows that the process is running in the task manager but will not open the window even after closing the prcess and restarting.

I have had firefox since an earlier 2. version and have been able to upgrade as normal. After the installation is done it will not open at all. I have restarted and even uninstalled all previous version .exe and still nothing. I am using windows 7 OS. I am still running 3.6.8 and would love to see the new one running on my laptop.

hello, this crash is caused by Websense Endpoint security software that is running on the system. please try to install all the updates for this program that are available...

Firefox will not open. Unable to uninstall because message says Firefox is running. How do I turn it off?

I upgraded Firefox after upgrading to windows 8.1 now firefox will not open but when I try to uninstall the program I get a popup telling me to close firefox. The task manager says nothing is running. Help.

Try restart your computer then try unistall, then get the most recent version here:
*[http://www.mozilla.org/en-US/firefox/all/ Last Firefox]
*[https://support.mozilla.org/en-US/kb/install-firefox-windows Install Firefox]
Also:
*[https://support.mozilla.org/en-US/kb/uninstall-firefox-from-your-computer Uninstall Firefox]

I've just updated firefox and now it will not open at all. Please help!

I use gmail and a couple of days ago I started having trouble accessing it and in fact any google related site. Apparently my version of firefox was not supported so I updated to the current version this morning but then found that firefox would not open at all. There are no error messages. I have tried restoring my settings to those of yesterday but although my system says I have returned to the old version 3.5.15 it still will not open. I can now only access the internet by using an ancient version of Microsoft Internet Explorer - which is also not supported by gmail. Although I'm limping on I could really do with some help!!

Perhaps give one of the following documents a try:
iTunes for Windows Vista or Windows 7: Troubleshooting unexpected quits, freezes, or launch issues
iTunes for Windows XP: Troubleshooting unexpected quits, freezes, or launch issues

I have tried everything that has been suggested and even deleted and downloaded Firefox again and it will not open. Any ideas on how to get it to open?

I have been trying to get Firefox to open up and everytime I double click on the icon nothing happens. I have gone to the task manager and deleted it from the process list and tried again and still will not open. I have even tried deleting the program and downloading it again and it still will not open.

What was the full wording of the error message? Usually there is also a number or additional information.
Try placing the iPod in Recovery Mode and then restore
Next try DFU mode and restore.
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings

I downloaded the newest versus of firefox and now it will not open. I've ctrl-alt-delete and under processes ended the process and it still doesn't open.

I'm using Int. explore right now because firefox will not work. Every time I turn on my computer in the morning it will not work.

The message box will have an option [start new session] try clicking that.
If that fails you may need to delete sessionstore.js and its coppies and backups to get the sytem working again, but lets try the obvious solution first.

I am running windows 7. We updated firefox and it would no longer open. I uninstalled it and reinstalled from firefox website. I click on the firefox icon and it will not open. Help please

It installs and I attempted to launch the browser and it never starts. I tried to uninstall, but it says firefox is running. I restart my computer and uninstall and try again. It still will not open after install is complete. Why won't it ever open up? Help please!

Right-click on your Windows Taskbar and select Start Task Manager. Look in Task Manager for processes running that are Firefox-related, such as Firefox.exe or plugin-container.exe. If you see either of those, right-click each of them and select "End process". Then try again to start Firefox in [[Safe Mode]]. 
*If Firefox will start in Safe Mode, select the option you are presented with to disable your add-ons and plug-ins and restart Firefox normally. You likely have a plug-in, add-on, or a combination of two or more that is causing the problem. Because Firefox allows users to customize endlessly, sometimes there can be conflicts between customized items. From the Firefox menu bar, go to Tools -> Add-ons then re-enable them one by one, restarting Firefox after each and testing after each one to see which one or combination of two or more is causing the problem. 
*If Firefox will not start in Safe Mode, make sure you again check Task Manager and end any running instances, then uninstall Firefox and download a fresh copy from mozilla.org/firefox using another browser temporarily. Re-install Firefox (see: [[Installing Firefox on Windows]] for more help ) and try running Firefox again.
Please report back your progress.

I have downloaded the new Firefox 4 but it will not open and i have tried to uninstall and reinstall the new version.

I have tried 8 to 10 times to uninstall and reinstall Firefox 4. I have since checked my firewall settings and firefox is allowed. It simply just will not open for me. I previously have had firefox and it was simply an update from the 3.6 version. I have websites i need to used saved under my bookmarks and cannot access them in internet explorer

Check out this thread: Downloaded Lightroom CC but only get a quick flash of the startup screen then nothing, Lightroom 5 still working.

Firefox 4 upgrade failed, will not open or let me uninstall it without a computer restart message

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