I can't open Firefox 3.0 now I've upgraded to AVG free 2011

On 29 Nov I upgraded to AVG Free 2011. Then I clicked the Firefox program icon to open Firefox, but nothing happened.
I then tried to download Firefox 3.6. I found a large number of programs downloaded to my temp file but no 'Install' instruction appeared.
I attempted the solution proposed for AVG 9.0 but found no link from AVG User Interface to AVG Internet Security. Is there a solution for AVG Free 2011 available? Or is my problem a different one? How do I get my Firefox toolbar back please?

To avoid confusion: http://kb.mozillazine.org/JavaScript_is_not_Java
* https://support.mozilla.com/kb/JavaScript
Start Firefox in [[Safe Mode]] to check if one of the extensions 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
You have a corrupted user agent that identifies you as Firefox/3.5.7
*Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.21) Gecko/20110830 Firefox/3.5.7;MEGAUPLOAD 1.0
See:
*https://support.mozilla.com/kb/Websites+or+add-ons+incorrectly+report+incompatible+browser
*http://kb.mozillazine.org/Resetting_your_useragent_string_to_its_compiled-in_default

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Can only open firefox once, have to restart to open more than one browser. can't upload any pictures the box doesn't pop up, my browser settings are diff now

Firefox just changed out of nowhere. I can only open firefox once... I used to have atleast 2 browsers up using them both on different sites, but now I can't have but one firefox browser up (not tabs, but firefox pages) Also when I am trying to upload images on ebay or any other site nothing happens... nothing pops up. I click it over and over and nothing even pops up. This is exactly what happens with the firefox browser in my first question... I can click the firefox icon a million times and nothing comes up. My tabs are all gone and it doesn't show anything like I had before this all changed? Did I reset everything some how? I do not recall clicking anything to go back... I do remember clicking an update because it kept poping up so I did it and that is the last thing I remember before this happened! UGHHH!

As I asked previously are you able to have tabs open as a window by using the right clicking option ?
When you close Firefox you should use
*'''Firefox button -> File -> Exit '''
Are you doing that ?
I suspect what may be happening is Firefox is hanging as it closes down.
* see [[Firefox hangs or is not responding - How to fix#w_firefox-hangs-when-you-quit-it]]_firefox-hangs-when-you-quit-it
* this explains how to check & if necessary kill the process [["Firefox is already running but is not responding" error message - How to fix it#w_end-firefox-processes]]_end-firefox-processes
A related possible problem is that you may have built up many copies of the restore files. These are stored in the Firefox profile. The easiest method of finding the profile location istouse
*use '''Firefox button -> Help -> Troubleshooting Information -> [Show Folder]'''
*see [[Profiles - Where Firefox stores your bookmarks, passwords and other user data]]
You need to look for the files ''sessionstore.js'' and numbered duplicates of that. Delete them.
* see http://kb.mozillazine.org/Firefox_hangs#Multiple_sessionstore.js_files

I downloaded new Firefox but now can't open Firefox at all. It says it is not supported on my system. How can I get the earlier version which I deleted?

I downloaded new Firefox but now can't open Firefox at all. It says it is not supported on my system. How can I get the earlier version which I deleted?

http://www.mozilla.com/en-US/firefox/4.0/system-requirements/ 
Mac
Operating Systems
* Mac OS X 10.5
* Mac OS X 10.6
Recommended Hardware
* Macintosh computer with an Intel x86 processor
* 512 MB of RAM
* 200 MB hard drive space
For older Macs that aren't supported in Firefox 4.0, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 . 
http://www.floodgap.com/software/tenfourfox/

Downloaded Firefox 4 to my Mac OS10.5.8 and now can not open Firefox.

Downloaded Firefox 4 to my Mac OS10.5.8 and now can not open Firefox. The processor is 1.25 GHz Power PC G4 and 768 MB DDR SDRAM memory. Is it possible to go back to an earlier version that was running very well on my Mac?

Firefox 4 requires at least OS X 10.5 and an Intel Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox
If you prefer, you can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

Operating System Window XP Professional. I can not open Firefox. I have reset it and it worked for a few days. Now I can not execute it. Appreciate help.

Can not execute Firefox. So I updated it and reinstalled it. Then I reset it. For a couple days it worked fine. Now I am back to square one. Can not open firefox again.

Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox and any leftover program files and then reinstall Firefox. Please follow these steps one by one:
#Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu) and confirm all upcoming messages.
#Now, uninstall Firefox by following the steps mentioned in the [[Uninstall Firefox from your computer#w_uninstall-firefox|Uninstall Firefox]] article.
'''IMPORTANT:''' On Windows, the uninstaller has the option to remove your personal data and settings. Make sure that you do '''not''' check this option; otherwise all of your bookmarks, passwords, extensions, user customizations and other Firefox [[Profiles|user profile data]] will be removed from your computer.
After uninstalling Firefox on Windows, delete the "Mozilla Firefox" program folder, located by default in one of these locations:
* '''(On 32-bit Windows)''' ''C:\Program Files\Mozilla Firefox''
* '''(On 64-bit Windows)''' ''C:\Program Files (x86)\Mozilla Firefox''
#Go to the Windows Start menu and click on "Computer".
#In the Explorer window that opens, double click Local Disk (C:) to open the C:\ drive.
#Find the "Program Files (x86)" folder or "Program Files" folder.
#* On 32-bit Windows, double-click the '''Program Files''' folder to open it.
#* On 64-bit Windows, you will see a "Program Files (x86)" folder AND a "Program Files" folder. Open the '''Program Files (x86)''' folder.
#Look for a '''Mozilla Firefox''' folder. If you find one, right-click it and select ''Delete'' and confirm that you want to move the folder to the Recycle Bin.
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.
Please report back to see if this helped you!

Hi I have been using Thunderbird and Firefox for at least seven years. I do not like Outlook or Internet Explorer. However, I had to sync my PDA phone today with Outlook and now I can't open Firefox at all. I get an error that says:

I had to sync my PDA phone today with Outlook and had to create an account in outlook , but only for the contacts and calendar. But after synching the phone, can't open Firefox at all. I get an error that says:

i wish i could paste the error message but it is

Can only open firefox as admin, otherwise get error to say a security component could not be initilaised. Have tried deleted cert8 file but it is not recreated and still will not open

Had problems with os and now can not open firefox unless I run as admin. Error appears - Could not initialise the application's security component. The most probable cause is problems with files in your browser's profile directory. Please check that this directory has no read/write restrictions and your hard drive is not full or close to full. It is recommended that you exit the browser and fix the problem. If you continue to use this browser session, you might see incorrect browser behaviour when accessing security features.
I have tried deleting the cert8 db file but it is not recreated when I start firefox again. HD has lots of room. Can you suggest anything else to try please?
thanks, mandi

If deleting or otherwise removing the cert8.db and secmod.db file doesn't help then try a new profile.
*https://support.mozilla.org/kb/Could+not+initialize+the+browser+security+component
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

Can't open Firefox or Thunderbird after Window 7 update

A Kapersky update and a Windows 7 update clashed and turned off the program. I completed a system restore to two days prior, installed the update successfully, then reinstalled all the Windows 7 updates, 13 of them. Now I can't open Firefox or Thunderbird. The Properties/settings say the the Windows XP update is incomaptible with them. I'm not running XP, so I changed the settings to read Windows 7 for both programs. Still cannot open either one.

you would plug your device into your computer and back it up so you don't loose anything on it. And then in itunes there is a button to click to restore your device. This will erase your device and reinstall ios to factory settings and then from there you can load your backup to your device. This has helped me with any problems i have had with ios7
http://support.apple.com/kb/HT1414

I can't open firefox. The home page doesn't come up, I just keep getting the Crash Reporter asking to restart/quit but every time I do this the same message comes back.

I can't open Firefox. The home page doesn't come up, I just keep getting the Crash Reporter asking me to restart/quit but every time I do this the same message comes back. I've not been able to use Firefox for days now.

Since a few days we have a lot of crashes with [http://www.trusteer.com/product/trusteer-rapport Trusteer Rapport]. If you have this program, try to disable it and see if that stops the crashing. 
You can stop Rapport using Start Menu > Programs > Trusteer Rapport > Stop Rapport 
You can ask their helpdesk when an updated version of their product will be made available or, if you don't need this software, uninstall it. 
http://www.trusteer.com/support/en/report-problem 
If you do not have Rapport, then we need to have a crash report ID. When you send Mozilla a crash report it just puts it in a giant database. We have no way of looking it up without the Report ID. I have no idea what is wrong without looking up the crash report. Please get the Report ID of your latest crash report. 
See https://support.mozilla.com/en-US/kb/Firefox%20crashes 
or http://kb.mozillazine.org/Firefox_crashes

I don't have firefox on my desktab so i can't open firefox. What to do?

I can't open firefox on my computer beceause there is no icon to klick on

-> Go to Mozilla Firefox folder in Program Files -> right-click '''firefox.exe''' -> go to '''Send to '''and click '''Desktop (Create shortcut)'''
-> Close Program Files folder -> Firefox shortcut will be on your Desktop now
Check and tell if its working.

I can't open Firefox no more, I try clicking on the icon but it doesn't even load anymore.

After some time I realized I can not open Firefox anymore.
I have always used Firefox as my default browser and I really like their features, it's the best browser for me, but for 2 weeks I haven't had the possibility to open it.
I have tried many ways, such as try to open new tab, or try to open new windows, or try to open new private session but none worked. It's impossible to load Firefox. I have been searching on different sites to finally resolve my problem but it didn't help me at all.
I also reinstalled it many times but the same problem.
Thanks in advance and any help will be welcomed.

sorry for the inconvenience caused to you. This may not be a problem with the fire fox instead this may be a problem with your computer.
Plz check your computer for virus mainly "Trojan". download an antivirus and run a full scan and also be updated to latest fire fox version.

HT5361 I can't shut down my computer because it says mail is open. It says to close mail and continue shut down. Problem is I can't open or close mail now. Can't shut down my computer at all. What can I do?

I can't shut down my computer because it says mail is open. It says to close mail and continue shut down. Problem is I can't open or close mail now. Can't shut down my computer at all. What can I do?

If you cannot get mail to quit/force quit, you can always remove power from your Mac.
NOTE: removing power is a bad idea, and can result in data loss, but sometimes it is the only thing left to do.
Press and hold the power button for 5 to 10 seconds, and the Mac will power off.
When you power back on, the Mac should reboot.

I can not open Firefox due to a virus. Can I un-install and then re-install Firefox and save my original setup and favorites

I can not open Firefox due to a virus.
When trying to open Firefox, the program directed the computer to shut down, and prevented me from going into Safe mode.
The virus only affected Firefox and rebooting in Safe.
The virus has been scrubbed, but I get the crash report every time I try to open Firefox. Can I install a new version of Firefox and still keep my bookmarks/ How can I rescue my bookmarks.
I am posting this from another computer location.

I used to have a slightly similar problem. Not the Virus problem, but the re-install of Firefox. The solution for this in the future would be for you to install and use FEBE Firefox Environment Backup Extension so you can fully back-up your settings, and other Addons, and Themes etc. that were within your FEBE backed up profile, so you can do the re-install of Firefox and then restore your saved profile that encompasses all of or most of what you presently don't want to loose. You could still do a FULL PROFILE FEBE, and re-install Firefox, and do a FULL PROFILE RESTORE, and if you might no longer have a virus problem after the restore. If so, your in good shape. I would find and run a good quality Anti-Virus scan, and if you wish to try to catch what you might have missed with the new scan I also suggest from www.IOBit.com that you add 2 programs that look to be better at catching problems than most other scan and repair utilities. The programs I suggest you add are called Advanced System Care - presently is version 5, and IOBit Malware Fighter, and one other. Their super powerful Smart Defrag that is faster than most Defrag programs and their is only one other Defrag program that comes close to it's power, and that is Diskepper, and you get Smart Defrag for free, and it's better, and faster than the others in my opinion. ASC Advanced System Care will clean your system and make it run faster specially if you have noticed it is slowing down for one reason or another , and it will do this with less resources than the other programs that you may already be using. The only thing they lack at present is an Anti-Virus portion which would add much more value to the already super programs. Good Luck. Let me know what you think after trying the noted programs. You should be very satisfied of the results.

I can't open firefox in safe mode -- firefox is frozen, I can't open the firefox menu, and I can't quit to reopen in safe mode

-I am on a Mac.
-Firefox was behaving strangely, so I quit it.
-Upon attempting to reopen firefox, the situation occurred.
-Firefox is frozen.
-I can not get into the firefox menu. If I click on the firefox icon it still shows me the finder menu (no window appeared either. There are no outward signs firefox is open.)
-I can not open it in safe mode because I can not force quit it either.
-In the force quit menu it says firefox open, but nothing happens when I attempt to force quit it.
-I got no error message.
-In other words, Firefox is totally unresponsive. I can neither interact with it or force quit it.
To the solution...
-Upon research I believe its a problem with my theme, but I repeat I can not open firefox in safe mode.
-As I said, it says firefox is open but I can not interact with it.
-I can not restart my computer because it says firefox is open.
-I can not delete firefox because it says firefox is open.
I am posting this from Safari.
Please help, and thank you in advance.

''Scott [[#answer-710824|said]]''
<blockquote>
With a Finder window open, are you able to force quit Firefox by selecting the Apple menu > Force Quit > Firefox?
There are another couple of way you can start Firefox in Safe Mode: one is to hold down the "Option" key when you click Firefox in the dock. The other is to run the following command in a Terminal window:
<pre>/Applications/Firefox.app/Contents/MacOS/firefox-bin -safe-mode</pre>
Terminal.app can be found in Applications > Utilities. Just paste in the line above and hit the enter key.
</blockquote>
The Terminal command worked like a charm, thanks.

I just updated firefox TODAY 8/17/11 and after the update i can't open firefox unless i restart my computer or i delete going to windows task manager and process, also i can't open a new window, it won't allow it. please can you help me

I just updated firefox TODAY 8/17/11 and after the update i can't open firefox unless i restart my computer or i delete firefox going to windows task manager and process, also, i can't open a new window, it won't allow it. please help me, everything works on IE, Google Chrome and Safari, everything went wrong after the update

Hey Elaine07!
I have an article here that can help you with that issue. This article will help you make sure you have uninstalled iTunes correctly and help you troubleshoot the launch issues you are seeing:
iTunes for Windows Vista or Windows 7: Troubleshooting unexpected quits, freezes, or launch issues
http://support.apple.com/kb/ts1717
Take care, and thanks for visiting the Apple Support Communities.
-Braden

I can't open Firefox 3.0 now I've upgraded to AVG free 2011

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