Everytime I download Firefox and then try to run it, I get a "file corrupted" message.

After downloading Firefox 6, I have tried to run Firefox 6 on three different computers and each time I get a message "file is corrupt". I tried it on different computers because I thought maybe there was a problem with the computer that I downloaded it on, but I get the same result. What am I doing wrong?

In the following, try the suggestions in 9, 10, and 11 in the following article first. If that does not work, look at the remainder of the suggestion in the following article.
*for article click here --> [http://kb.mozillazine.org/Unable_to_save_or_download_files Unable to save or download files (Mozillazine)]
Also see: [https://support.mozilla.com/en-US/kb/unable+to+download+or+save+files Unable to download or save files (Firefox support)]
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Everytime I close Firefox and then try to reopen it, it says that I am unable to do so as Firefox is already running (even though it's closed) and I have to restart my laptop all the time.

For about a week now when I have closed Firefox down then I try to reopen it the screen message states that Firefox is already running and I have to restart my laptop every time. This is becoming very frustrating and time-consuming.

I have the same problem on my notebook but I don't restart. Just do the control, alt, delete and bring up your task manager. Then scroll down to Firefox, end process and close. Now you should be able to restart FF. Not a fix but better than having to restart your laptop.

If I close a session on Firefox and then try to reopen it, I get a screen that says "you must close your current session because Firefox is already running".

The power went out and when it came back on, my computer seemed fine. I was able to access the internet through Firefox as usual. However, if I closed my session and tried to reopen it, it would say that there was already a session open and that I would have to close it before trying again. I would have to go to the task manager and find Firefox in the list of processes and end the process in order to get back to the internet. I have tried restarting my computer twice. What could be the problem?

Try to wait a bit longer before reopening Firefox to give Firefox more time to close completely. 
You can also try to use Firefox/File > Exit to close Firefox.
See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
*https://support.mozilla.com/kb/Firefox+hangs
See also:
* http://kb.mozillazine.org/Profile_in_use
* https://support.mozilla.com/kb/Firefox+is+already+running+but+is+not+responding

All the fonts become transparent in Firefox and then I cant run any other windows programs.

After a couple of hours of being open, all the fonts in firefox 3.6.12 turn transparent, and it seemingly freezes. Then, it takes windows down with it. I cant open any programs, not even the task manager. All the fonts in windows so blank. I have to close firefox and then I can use programs again. I scanned for viruses and found nothing. This only happens with firefox, and it started pretty recently. I figured maybe one of the extensions is to blame. I updated flash recently and I thought it was the culprit but I uninstalled it recently and the freezing still happens.
The fonts all turning transparent is a pretty unique symptom I think. I googled a lot but no one seems to be having the same problem. I'm at the end of my rope here.

Similar thread: [https://support.mozilla.org/en-US/questions/929692 Only Yahoo and Bing appear in the search box and the Search engine manager only shows them too.]
You can check the following folder to make sure the google.xml plugin is included in your installation of Firefox:
C:\Program Files (x86)\Mozilla Firefox\searchplugins
If it's there, but it doesn't appear in the search box, there could be a corrupted file in your settings folder (AKA your Firefox profile folder). If it's missing, then you might consider reinstalling Firefox over you existing installation to fill in the gaps.
I recommend backing up your Firefox settings in case something goes wrong in that process. See [[Backing up your information]]. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)

When I close Firefox and then try to open it, it says it is already running and I have to close it which I can't do. The only way to open it is to first restart my computer which is a pain. If I can't fix this I will use an other brouser!

I am not sure what more I can tell you. I close firefox. So when I click on the icon it should allow me to open it again but I get a message that says it is already running. Either close it out which I can't do since I already did that or restart the computer.

Try holding control, alt and delete down in succession and then a dialogue box will appear with windows task manager. Once open click on the Processes Tab and look for firefox.exe. Highlight this and then click end process. It should come up with a warning but just click Yes. This should then close firefox and allow you to reopen it from your desktop without shutting down your computer. Hope this helps.

I close Firefox and then try to shut down my computer, but Windows says that Firefox is still running. It does not show up as running in Task Manager. I have uninstalled and reinstalled several times with same result.

I have also had problems starting Firefox. I click the icon and nothing happens. That problem is intermittent. The Windows message that Firefox is still running after I have closed the Firefox browser keeps occurring and I do not know how to remedy this.

The one thing that is locking up fire fox is the plug ins. You have to check to see if a plug in is locking up firefox first of all.
To see the processes press : CTRL+ALT+DEL. then click the tab marked "Processes" Then look for Fire Fox and click on it. Click the Yes button when the warning box show up.
Then do the say for "Plug-in Container" I believe that is called.
this is because all ads are now flash ads or video ads. They lock my computer up all the time.
When the CTRL+ALT+DEL are pressed. Keep this minimized and you can see if your computer is running at 100% memory near the clock. If the box is totally green, you are running a lot of programs on your system. Check the processes and find out what is not needed. Also watch your virtual memory. Rule of thumb is 1.5x total memory.
Then now it would be able to shut down the computer the right way.
Hope this helps you out.

When i close firefox and then attempt to restart it i get the following message. firefox is alreadt running,but is not responding to open a new window.you must first close the existing firefox process or restart your system.

i have to restart

Sounds like Firefox is "hanging at exit". That problem is frequently caused by an Extension or a Plugin. Read all of the following articles. 
#Stop the Firefox process:
#*[http://kb.mozillazine.org/Kill_application Mozillazine - Kill application]
#*Windows 7 users click [http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576 here]
#*Mac users: http://techheavy.com/2011/02/the-mac-task-manager/
#Why Firefox may hang:
#*[http://support.mozilla.com/en-US/kb/Firefox+hangs Firefox hangs] (see Hang at exit)
#*[http://kb.mozillazine.org/Firefox_hangs Firefox hangs (Mozillazine)] (see Hang at exit and Closing Firefox properly)
#*[https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding Firefox is already running but is not responding]
#Use Firefox Safe Mode to find a problem with an Extension or Plugin:
#*Don't check anything when entering Safe Mode, just continue
#*If the problem does not occur in Safe Mode it is probably and Extension or Plugin causing the problem
#*See:
#**[[Safe Mode]] and [http://kb.mozillazine.org/Safe_Mode Safe Mode (Mozillazine)]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
#**[http://support.mozilla.com/en-US/kb/Basic+Troubleshooting Basic Troubleshooting]
'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''
Not related to your question, but...
You may need to update some plug-ins. Check your plug-ins and update as necessary:
*Plug-in check --> http://www.mozilla.org/en-US/plugincheck/
*Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.com/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox]
*Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.com/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox]
*Shockwave Flash (Adobe Flash or Flash): [https://support.mozilla.com/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox]
*Next Generation Java Plug-in for Mozilla browsers: [https://support.mozilla.com/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

When I close Firefox and then try to reopen it cannot and says Firefox is still running

If I try to reopen Firefox after closing the application, I receive a message that it cannot open because " Firefox is still running"
I am operating with Vista Premium 64bit
My only solution is to restart my computer.

Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.
*Java Plug-in 1.6.0_13 for Netscape Navigator (DLL Helper)
Update the [[Java]] plugin to the latest version.
*http://java.sun.com/javase/downloads/index.jsp (Java Platform: Download JRE)

No matter what fixes I've tried, everytime I close Firefox and then reopen it, it has lost everything I changed or added! It reverts back to the default "welcome to Firefox"! Every fricken time!

I downloaded the 3.6.12 version. I have Windows 7, could that be the problem? I used Firefox exclusively when I had Windows XP and never had this problem!

Does this help [[Preferences are not saved]]

When i get off the internet and i think i am closing firefox and then try to open it up again it tells me firefox is still running and i need to turn it off or restart my computer before opening firefox again. what can i do to fix this

also on facebook alot of the buttons and photo don't show up unless you scroll the arrow over the place where the buttons are

Sounds like Firefox is "hanging at exit". That problem is frequently caused by an Extension or a Plugin. Read all of the following articles. 
#Stop the Firefox process:
#*[http://kb.mozillazine.org/Kill_application Mozillazine - Kill application]
#*Windows 7 users click [http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576 here]
#*Mac users: http://techheavy.com/2011/02/the-mac-task-manager/
#Why Firefox may hang:
#*[http://support.mozilla.com/en-US/kb/Firefox+hangs Firefox hangs] (see Hang at exit)
#*[http://kb.mozillazine.org/Firefox_hangs Firefox hangs (Mozillazine)] (see Hang at exit and Closing Firefox properly)
#*[https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding Firefox is already running but is not responding]
#Use Firefox Safe Mode to find a problem with an Extension or Plugin:
#*Don't check anything when entering Safe Mode, just continue
#*If the problem does not occur in Safe Mode it is probably and Extension or Plugin causing the problem
#*See:
#**[[Safe Mode]] and [http://kb.mozillazine.org/Safe_Mode Safe Mode (Mozillazine)]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
#**[http://support.mozilla.com/en-US/kb/Basic+Troubleshooting Basic Troubleshooting]
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When I close firefox and then try to reopen it later it often says that it cannot open firefox because it is already open and that I must close it before it can open a new window.

When I look at the task manager it is not listed at all. It will work if I restart my computer.

See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]

Sometimes when I close Firefox and then try to reopen, I get a message that "Firefox is still running" and suggests I close it (which I have already done) or restart my computer, what do I do?

I really have had a problem with Firefox responding sluggishly for the last 6 months or so. I have difficulty opening it, closing it properly, freezing up. I don't have this problem with other programs, so don't know what is going on. Also I can't use my latest version....10 of Adobe Acrobat now. Dont know if that is my computers fault or Firefox. Any help will be appreciated.

See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]

Recently downloaded Firefox 4. Now when loading it, I get this Java Console Message: TypeError: Components.classes[cid] is undefined I click OK and everything works OK, but this didn't happen before.

Please tell me how I can get rid of a Java Console Msg. every time I load Firefox 4 (which I just updated to). This box pops up when trying to load Firefox: TypeError: Components.classes[cid] is undefined. I have to click on OK before it will load. ANNOYING. This didn't happen until I updated to Firefox 4.

That indicates that you have an add-on that is not compatible with Firefox 4. To find out which one, use the procedure in this link - https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

Attempting to install firefox but getting a file corrupt message

i'm using windows xp on my laptop, the file is downloading however when i click run in order to install i'm getting an error message which reads file corrupt

Run the Firefox program once as Administrator (right-click: Run as Administrator).
If that doesn't solve the problem then do a clean reinstall and remove the Firefox program folder.
* http://kb.mozillazine.org/Software_Update (Software Update not working properly)
* [[Software Update Failed]]

Itunes wont let me download anything for my ipod touch. everytime i try to it keeps looping thru to verify my account, so i do and then try to download and it loops me right back thru again to verify my account. HELP ME PLEASE :(

everytime i try to it keeps looping thru to verify my account, so i do and then try to download and it loops me right back thru again to verify my account. HELP ME PLEASE

Contact iTunes. Select the appropriate topic of:
Apple - Support - iTunes

Everytime I download Firefox and then try to run it, I get a "file corrupted" message.

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