Firefox wont open and the task manager wont open as well

My firefox wont open and when i try to fix it by managing profiles, it wont start up. when i try to go through the task manager it also wont start up. i dont know what i can do to fix this. ive tried uninstalling and installing tons of times. i just dont know what to do

Clint:
Welcome to Apple Discussions.
In terms of the Firefox issue. Boot the computer and log in. Then go to Apple Menu > System Preferences > Accounts > Login Items and see if Firefox is listed there. If it is, then select it and click the minus sign at then bottom left. The reboot the computer and try to launch Firefox.
A couple of other things to check. Open a Finder Window (Commnand + N when in Finder) and look in the sidebar. Do you see a white disk-like icon named Firefox? If you do, click on it, drag the Firefox icon into the Applications folder, then eject the white disk icon.
If neither of the above work, hold down Command + Option + esc. Do you see Firefox in the list of items to Force quit? If you do, select it and Force quit.
Please let me know if any of these work.
In terms of Dashboard, do you have the install disk for the OS you have installed?
cornelius

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No, most likely not. I reckon you got some antivirus software on your machine, don't you?
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Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test to see if that helps.
Do a malware check with some malware scanning programs on the Windows computer. 
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*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
*AdwCleaner: http://www.bleepingcomputer.com/download/adwcleaner/ http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
*SuperAntispyware: http://www.superantispyware.com/
*Microsoft Safety Scanner: http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: Home Page: http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
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*Kasperky Free Security Scan: http://www.kaspersky.com/security-scan
You can also do a check for a rootkit infection with TDSSKiller.
*Anti-rootkit utility TDSSKiller: http://support.kaspersky.com/5350?el=88446
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

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please check http://forum.sysinternals.com/how-do-i-see-my-task-manager-again_topic2606.html
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https://support.mozilla.com/en-US/kb/Firefox+hangs#Hang_at_exit

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I close out Firefox and a sign still comes up saying it's open and won't let me open anything else. In task manager it is not open even when the sign says so.

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Hi,
This may mean the Task Manager is "lying" and could indicate a OS malware issue. These dedicated security forums would be helpful:
http://www.wilderssecurity.com/
http://www.spywareinfoforum.com/
http://www.spywarewarrior.com/index.php
http://www.bleepingcomputer.com/forums/forum79.html

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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.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

After closing Firefox and trying to open a new session, I get periodic pop ups telling the program is still running. I open the task manager and close it, and everything's fine. What's the issue, and how do I get it to stop?

Problem doesn't happen every time, and I've tried to leave it alone to see if there's an update that needs to finish loading. After being left overnight, I still had to use the task manager to close the Firefox program. I have no idea what it's doing, and I'd like to know. Is Firefox taking over my computer so it can move on to my house, and then go on to rule the Tri State Area?

See - [https://support.mozilla.com/en-US/kb/Firefox%20hangs#w_firefox-hangs-when-you-quit-it Firefox hangs when you close it]

Sometimes Firefox will not open, telling me, it is already running. It does not show in the task manager and the only solution is to reboot.

Firefox is running. I close the program. I try to reopen it. I get an error message: Firefox is already running. It does not show in the task manager, nor anywhere else. I can not close the old version, nor start a new one. I have to reboot.

Did you look in the Processes tab in the Task Manager?
See also "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]

My computer crashed and I cant reload firefox.. I have tried the task manager and deleting uninstalling and installing program again. I click on icon and nothing appears although is running in task manager

My computer crashed and I cant reload firefox.. I have tried the task manager and deleting uninstalling and installing program again. I click on icon and nothing appears although it appears to start and is running in task manager, but the browser wont open.

See:
*http://kb.mozillazine.org/Browser_will_not_start_up
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.com/kb/Server+not+found
*https://support.mozilla.com/kb/Firewalls

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Firefox wont open and the task manager wont open as well

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