I get this message everytime I open Firefox: "[JavaScript Application]" and the message is: "TypeError: test is undefined."

This issue can be caused by an extension that isn't working properly.
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
Start Firefox in [[Safe Mode|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

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I tried down loading mozilla firefox to use as a web browser. It was downloaded 100% then when prompted to "run" the error message comes up with a red cross and the message'This file is corrupted" and won't let me proceed. What do I do now?

I tried down loading mozilla firefox to use as a web browser. It was downloaded 100% then when prompted to "run" An error message comes up with a red cross and the message'This file is corrupted" and won't let me proceed. What do I do now?

It is possible that your anti-virus software is corrupting the downloaded files or otherwise interfering with downloading files by Firefox. 
You can try to disable the real-time (live) scanning of files in your anti-virus software temporarily to see if that makes downloading work.
See http://kb.mozillazine.org/Unable_to_save_or_download_files

July 18,2011 AOL toolbar update install. I cannot open Firefox to uninstall the update or the toolbar because everytime I open Firefox it freezes and jams up. I have to shut down my computer as it will not even respond to force quit command

July 18,2011 AOL toolbar update install. I cannot open Firefox to uninstall the update or the toolbar because everytime I open Firefox it freezes and jams up. I have to shut down my computer as it will not even respond to force quit command. I cannot read my mail (aol) or access my bookmarks all for work.

Try the Firefox SafeMode. 
''A troubleshooting mode, which disables most Add-ons.'' 
''(If you're not using it, switch to the Default Theme.)''
# You can open the Firefox 4/5/6/7 SafeMode by holding the '''Shft''' key when you use the Firefox desktop or Start menu shortcut.
# Or use the Help menu item, click on '''Restart with Add-ons Disabled...''' while Firefox is running. 
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut (without the Shft key) to open it again.''
You should be able to uninstall that AOL toolbar extension while running in the Firefox SafeMode.

When opening Firefox 6 I receive 2 JavaScript Application errors; the 1st is "TypeError: Component.classes[TvtPwmComponent_CID] is undefined". The 2nd error is; "TypeError:Components.classes[componentid] is undefined." How can I correct these errors?

When opening Firefox 6 I receive 2 JavaScript Application errors; the 1st is "TypeError: Component.classes['''TvtPwmComponent_CID'''] is undefined". The 2nd error is; "TypeError:Components.classes['''componentid'''] is undefined." and upon closing Firefox 6 I receive the following JavaScript error; "ReferenceError:'''M_caFxTBobj''' is not defined."

This issue can be caused by an extension that isn't working properly.
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
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

I am getting this error when I open Firefox after DLing Firefox 5 (never seen this in any other previous version): FATAL ERROR : The dynamic C library contained in the extension file could not be found.

Hi there,
I'm getting this error when opening Firefox 5:
FATAL ERROR : The dynamic C library contained in the extension file could not be found.
I've never seen this error before... First time it happened was immediately after DLing Firefox 5 yesterday. I haven't DLed or installed anything else recently.
I see that you already have my system info. Any help is much appreciated!

Just read in another post that there is a known 49 character limit on the file path for QuickTime movies..

A message keeps popping up saying JavaScript Application and under it uninstal set. How can I get rid of it?

The box keeps popping up every time I bring up a new page or refresh a page, saying at the top JavaScript Application and at the bottom uninstal set. Don't know how to get rid of it. Can someone help me?

I had this problem too, drove me crazy until my son figured out that it was just Firefox (we also use Internet Explorer)...I looked on the help site & immediately saw that others had the same problem.
First I did the "DISABLE Java Console 6.0.22" that did not work, so I disabled the Yahoo toolbar (as another user had mentioned). I don't know if it was just the last thing, or both...but the annoying pop up is gone! Yaaay! It only took a few minutes.
Firefox Help is great! Thanks to those who post their fix, it does help the rest of us!

How do I restore my Firefox profile when I cannot even open Firefox because I receive the message "a copy of Firefox is already open?"?

I was able to use firefox, but all my bookmarks and history disappeared. Also, the forward and back arrow and refresh buttons weren't working. I followed the directions for restoring firefox profiles, and that didn't work. I wasn't able to open firefox again, and I received the message: "a copy of firefox is already open. only one copy of firefox can be open at a time." I tried closing firefox, even uninstalling it and reinstalling another file, but I still get the same message over and over again.

Hello Nicole.
If that's the message that appears, hHopefully this support article is what you need:
http://support.mozilla.com/en-US/kb/Firefox+hangs

Everytime I close Firefox it gives me the message box that firefox has crashed

I close firefox with the X like I close all of my applications but every time I close it I get a popup box saying that firefox has crashed do you want to send a crash report and I can type in what happened. Then I can choose to close firefox or restart it.

Note that Firefox 3.6.x is not officially supported with Flash 11.3
Adobe Flash Player 11 | Tech specs:
* http://www.adobe.com/products/flashplayer/tech-specs.html

I updated Firefox to 4.0 and now I keep getting a box that says its a JavaScript Application and inside the box it says "Uninstal Set". What do i do???

I keep getting more and more of them at a time and its annoying me! Everytime I try to open a page in firefox or do anything this happens.

Someone else posted this issue recently. Do the suggestions in this thread help?
[https://support.mozilla.com/en-US/questions/813884 when open firefox or change website, there is a warning window, [JavaScript Application], "uninstal set" | Firefox Support Forum | Firefox Help]

When I open mozilla the rectangle saying "move firefox to applications" and the mozilla disc logo appear. How do I stop these appearing every time I open firefo

I just updated mozilla. It's working fine but now every time I open mozilla the recatbgle saying "move firefox to Applications" as well as the mozilla disc sign appear on my desktop. The rectangle disappears when I quit FF and the disc logo can be dragged to trash but how do I stop these appearing each time I open mozilla?

hello, please make sure that firefox is properly installed: [[Install Firefox on Mac]]

I got the same error message EVERYtime I opened Firefox. I am not currently using it as my primary browser because it is SO enoying What can I do

It doesn't let me copy the technical info I can't forward it I am so frustrated... I can't use my firefox

What is the error message?
Without seeing the error message this is just a guess, but a common cause of error messages is a problematic add-on. You can try the procedure in the [[troubleshooting extensions and themes]] article to see if it helps.

I get this error everytime i open itunes or quicktime

Never used to get it..just all of a sudden, tried repairing, reinstalling - but still get it!!
help!
[img]http://www.tricky97.f2s.com/error.jpg[/img]
Windows XP Pro

hi Trick!
... have you ever had Liquid or Pinnacle Studio installed on that PC? if so, see:
Error of 'Vafxu.dll missing' when launching Quicktime based application
(itunes counts as a QuickTime-based application.)
love, b

"Do you want to allow the following program to make changes to your computer?" I get this message in a box everytime I open firefox. I answer "Yes" but it continues. Please help.

<blockquote>Locking duplicate thread. 
Please continue here: [[/questions/856850]]</blockquote>
"Do you want to allow the following program to make changes to your computer?". I get this message everytime I open Firefox. I select "Yes" and then the program opens. However, I continue to get this question everytime I open firefox. Please help.

Can anyone answer my question?

Error code: MobileMe Services has encountered a problem and needs to close - I get this message everytime i open Outlook and it slows down opening? This problem started when itunes updated

Error code: MobileMe Services has encountered a problem and needs to close
I get this mesage everytime i open Outlook and it slows down opening. This problem started when itunes updated. What do I do to solve this?

Hi turingtest2 (you pass, BTW): Thanks for the speedy reply. MobileMe doesn't appear in the list of programs which can be uninstalled. I tried the link you suggest: http://support.microsoft.com/mats/Program_Install_and_Uninstall but when I tried to "Run Now", I get the error message: " Troubleshooting cannot continue because an error has occurred... etc.... [code 80072F8F]" So googled this error & found a tool called (80072f8f) Repair Tool - I'm leery to download yet more stuff from non-microsoft sites -- any recommendations?

I get an error whenever I open Firefox.

Since yesterday I got this error when I opened Firefox:
Could not initialize the application's security component. The most likely cause is problems with files in your application's profile directory. Please check that this directory has no read/write restrictions and your hard disk is not full or close to full. It is recommended that you exit the application and fix the problem. If you continue to use this session, you might see incorrect application behaviour when accessing security features.
Then Firefox crashes and creates a crash repost.
Thought it was a bug with the beta version, so installed v3.6.12. Same thing. Tried uninstalling the whole thing then reinstalling, didn't help.
What can I do?

hello, the file you have referenced appears to be part of Webroot SecureAnywhere - try to remove that software in case you have it installed on your system.

I get this message everytime I open Firefox: "[JavaScript Application]" and the message is: "TypeError: test is undefined."

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