When I try to start Firefox I get an Error Message: (Javascript /application) Error on adding toolbar element. TypeError, aButtonLabel is undefined. id. Google Shortcut settings

When I try to start Firefox I get an Error Message: (Javascript /application) Error on adding toolbar element. TypeError, aButtonLabel is undefined. id. Google Shortcut settings. Firefox will not start. I have been through the troubleshooting steps. Nothing helps
== I tried to enter Firefox. No apparant reason ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; InfoPath.2; AskTbGLSV5/5.8.0.12304)

Hi,
had this problem but now sorted.
Go to settings for google shortcuts, follow link to homepage and upload latest version, it has not yet been approved by Firefox, but works and solves the bug.
Hope this helps.
A

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When I start Firefox, I get this alert message "[JavaScript Application] XML tag name mismatch (expected META)". What is this message?

My firefox updated today automatically, and then when it started up, it displayed this alert message:
"[JavaScript Application] XML tag name mismatch (expected META)"
I can press OK and my browser then works just fine and I can go to websites and what-not. I have not run across any problems or anything. I am just wondering what this alert message means and if I should fix it?
I tried closing the browser and pulling it back up, and the same message was displayed. Also, if I open a new window the same message is displayed. But it is only displayed right when I open the browser, and does not show up anytime while using the browser.

If you click the Home button from another page, does the error repeat? If so, what is your home page?
When Firefox starts, it fires up a lot of add-ons. A standard diagnostic for add-on issues is to try Firefox's Safe Mode.
First, I recommend backing up your Firefox settings in case something goes wrong. See [[Backing up your information]]. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)
Next, restart Firefox in Firefox's Safe Mode ([[Safe Mode]]) using
Help > Restart with Add-ons Disabled
In the Safe Mode dialog, do not check any boxes, just click "Continue in Safe Mode."
Do you still get the message? If not, one of your add-ons might not be fully compatible with Firefox 14 or might need an update.

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When I try to start Firefox, I get a message that it is already running, but not responding and that I should close it before trying to run another Firefox. But I cannot find a way to close Firefox program that is not running as far as I can see. I tried uninstalling and reinstalling Firefox, but that did not work. I've tried various other things, but no luck. I thought programs should stop when the computer is turned off, but that didn't work either.

How are you opening the Profile Manager?
*http://kb.mozillazine.org/Profile_Manager
Sounds that Firefox is still or already running. 
See:
*http://kb.mozillazine.org/Kill_application

When I try to start Firefox, I get the error message "Your computer must be restarted to complete a previous upgrade of Firefox. Do you want to reboot now?" I have rebooted several times to no avail. Get the same message when I try to uninstall Firefox

When I try to start Firefox, I get the error message "Your computer must be restarted to complete a previous upgrade of Firefox. Do you want to reboot now?" I have rebooted several times to no avail. Get the same message when I try to uninstall Firefox

Just had this same problem. Based on other suggestions I found on the web, went to C:\Program Files\Mozilla Firefox and deleted all files that ended with upgrade and/or delete. Then I was able to uninstall Firefox and then reinstalled. Hope this helps!

When I try to start Firefox I get Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.

I get this message when I try to start Firefox after first logging on after turning on the computer.
Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.
Have rebooted. Works when Administrator logs in, just does this in my user profile. Have also re-intalled. Mo change in my User account.
Firefox was working fine for the last 3 1/2 years. Any suggestions?

Firefox is "hanging at exit" when you exit/quit Firefox. 
#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.'''

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Following an upgrade of my OS from XP to Vista, I tried to point the new installation at my old profile. Now when I try to start FF, I get a message saying that it is already running and I should reboot to clear the problem. I've done that but the problem remains. I have uninstalled firefox and reinstalled v4 beta. The problem remains. Any ideas?

OK, I had moved the profile file inside the profile folder which was created when I installed FF, to the main FF folder. I then took the equivalent file which existed under XP before my upgrade to vista, and moved it into the new Profile folder. That's when I hit the problem described in the initial question.
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#*http://support.mozilla.com/en-US/kb/Cannot%20uninstall%20an%20add-on
#*http://kb.mozillazine.org/Uninstalling_toolbars
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#**http://kb.mozillazine.org/About:config
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#**http://kb.mozillazine.org/Keyword.url
#**http://www.techrena.net/computers/address-bar-search-provider-firefox/
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'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''

When i try to start firefox i get a message that says proxy server refusing conections

had problems last night macafee said something was trying to download on my computer did i want t allow it i said no then everything froze up for a few minutes when everything was closed and i try to restart firefox i got the message proxy server refusing to connect i tried toturn of and turn back on my computer but still got the same message tried to restore system but only date i was given was 7-7-2010 so that did not help don't know what to do to fix problem
== This happened ==
Every time Firefox opened
== july 7th about 6:00pm

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*https://support.mozilla.com/kb/Basic+Troubleshooting#w_8-make-a-new-profile
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Constantly getting the following error message JavaScript Application error: "An error has occurred: error"

I about to give up on using Firefox since I've tried everything I know: cleared cache & reinstalled Firefox

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).
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*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
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*https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile
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*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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Hi,
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Of course I checked firefox crashes. I searched and haven't found my problem. I used Firefox 5 when it happened, then, seeing it doesn't work no matter what I do, I upgraded to 6. The same problem. So it's not 5 or 6 related. Computer probably wrote something to hard disk when it crashed and now the file is corrupted and prevents Firefox from starting. I don't know what file (or part of the registry) is. I could erase everything, but that would mean I will lose every Firefox settings and I don't want that. Now I am using Google Chrome to write this. I miss my Firefox. :( What else can I do ?
This is the error I get when I try to start Firefox:

After installing a new version of Firefox, I get the error message "The procedure entry point JS_GetOperationLimit could not be located in the dynamic link library js3250.dll" when I try to start firefox. Elsewhere in the forum a complete reinstall is su

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== This happened ==
Every time Firefox opened
== I installed a new version ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; GTB6; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648)

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When I try to start Firefox I get an Error Message: (Javascript /application) Error on adding toolbar element. TypeError, aButtonLabel is undefined. id. Google Shortcut settings

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