I have downloaded Firefox 4.0.1. Upon opening the browser, I get the error message, JavaScript Application. Type Error. Components.classes[cid] is undefined Help. Thanks.

I do not have this problem with my other browsers: Chrome, Opera, and Safari.
I had no trouble like this with earlier versions of Firefox, before 4.0.1.

That indicates you have an add-on that is not compatible with Firefox 4. For details of how to troubleshoot that see https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

Similar Messages

After I downloaded Firefox 4 and I try to open Firefox, I get this error message, "plug-in object: TypeError: Components.classes[cid] is undefined". I click "OK"; Firefox opens and works just fine. Any suggestions??

Not much to add. Before Firefox will open, I get this error message, "plug-in object: TypeError: Components.classes[cid] is undefined". I click the "OK" button; Firefox opens and I have no further problems.
I use an Apple with OS v. 10.6.7 and had no problems until I downloaded Firefox 4.0

That indicates you have an add-on that is not compatible with Firefox 4. For details of how to troubleshoot that see https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

Since upgrading to 6 I get "TypeError: Components.classes[cid] is undefined" when loading Firefox - why?

When loading Firefox or certain pages I get a message box appear with "TypeError: Components.classes[cid] is undefined" if I hit "OK" the system continues. This has only happened since the recent security upgrade to Firefox. I have downloaded Firefox and reinstalled but the message persists.

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

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

When I open Firefox, the browser does not open. Instead I get a small window that says: TypeError: Components.classes[cid] is undefined. How do I fix this?

I tried to uninstall AVG antiviral software, but it did not uninstall. Next, when I try to open Firefox I get a box popup that says:
TypeError: Components.classes[cid] is undefined.
If I click OK in that box, I can then open Firefox.
Also I can no longer update Java.
Help!

Possibly you have "AVG Safe search" extension installed as part of "AVG Free", solution involves reinstalling :AVG Free" without the Link Scanner component see
* http://kb.mozillazine.org/Problematic_extensions
* symptom was noted in https://support.mozilla.com/questions/865877
Other possibilities
* "OneClick YouTube Downloader 1.07" as reported in
*: https://support.mozilla.com/questions/864343
* "Java console" needs to be updated as reported in
*:https://support.mozilla.com/questions/863711]
* "HP Smart Print 1.0" as reported in
*: https://support.mozilla.com/questions/857283
* "McAfee Site Advisor" as noted in (also see Problematic extensions above)
*:https://support.mozilla.com/questions/802381
*a theme After switching to the default theme the JavaScript error doesn't appear. (View > Page Style > No Style or if "Firefox" button use "Alt" first to get to the View menu)
*:https://support.mozilla.com/questions/837840
*various extensions/applications but is 1 year back and Firefox 3.6.6
*:https://support.mozilla.com/questions/729606
If none of the above solve you problem use diagnostic approach...
*: https://support.mozilla.com/questions/837840

Firefox 4.0 displays an error code when launching: "TypeError: Components.classes[cid] is undefined", add-ons doesn't work and I can't open any web pages

Hello
I've been running Firefox 3.6.16 with no problems at all, and this morning decided to upgrade to Firefox 4.0, as the developer of the them I use, Foxscape, has upgraded it to work with 4.0. The installation appeared to be as normal, but when I launched 4.0, the following error message appeared: error "when launching firefox 4.0 TypeError: Components.classes[cid] is undefined". The browser launched, but while I could go to webpages if they were in my bookmarks, so no problems with my internet connection, but when I typed in a URL (for example google.co.uk) and pressed "go", nothing happened. Similarly, when I tried to go to add-ons, it was as if I hadn't clicked anything. I wondered whether it was an issue with Foxscape (although I've never had any problems before when upgrading, as the standard theme just appears) so I reverted to 3.6.16, switched the theme to standard, then tried upgrading to 4.0 again. The same thing happened, so I'm positive it's got nothing to do with Foxscape.
I run Windows Vista Home Edition on a Dell Inspiron. I also have IE 9 installed (I installed it a few weeks ago, and it's been running fine with 3.6.16). I've never had any problems with Firefox before; I'm very keen to upgrade to 4.0, and would appreciate your help in fixing this.
Thanks

Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]

How do I fix the following error, it comes up every time I open a Firefox page; "type error: Components.classes[cid] is undefined" (JavaScript Application)

== Issue
==
I have another kind of problem with Firefox
== Description
==
how do I fix the following error, it comes up every time I open a Firefox page; "type error: Components.classes[cid] is undefined" (JavaScript Application)
== This happened
==
Every time Firefox opened
== a few months ago
==
== Troubleshooting information
==
Application Basics
Name Firefox
Version 3.6.3
Profile Directory
Open Containing Folder
Installed Plugins
about:plugins
Build Configuration
about:buildconfig
Extensions
Name
Version
Enabled
ID
Adblock Plus 1.2 true
Adobe DLM (powered by getPlus(R)) 1,6,2,49 true
AVG Safe Search 9.0.0.825 true {3f963a5b-e555-4543-90e2-c3908898db71}
AVG Security Toolbar 4.504.019.002 true avg@igeared
Fasterfox 2.0.0 false
Forecastfox 0.9.10.2 true {0538E3E3-7E9B-4d49-8831-A227C80A7AD3}
Java Console 6.0.05 true
Java Console 6.0.03 true
Java Console 6.0.07 true
Java Console 6.0.11 true
Java Console 6.0.13 true
Java Console 6.0.15 true
Java Console 6.0.17 true
Java Quick Starter 1.0 true [email protected]
Microsoft .NET Framework Assistant 1.2.1 true {20a82645-c095-46ed-80e3-08825760534b}
NoScript 1.9.9.77 true {73a6fe31-595d-460b-a920-fcc0f8843232}
Java Console 6.0.19 true
Java Console 6.0.20 true
Modified Preferences
Name
Value
accessibility.typeaheadfind.flashBar 0
browser.history_expire_days 0
browser.history_expire_days.mirror 180
browser.places.importBookmarksHTML false
browser.places.importDefaults false
browser.places.leftPaneFolderId -1
browser.places.migratePostDataAnnotations false
browser.places.smartBookmarksVersion 2
browser.places.updateRecentTagsUri false
browser.startup.homepage_override.mstone rv:1.9.2.3
extensions.lastAppVersion 3.6.3
general.useragent.extra.microsoftdotnet ( .NET CLR 3.5.30729)
keyword.URL http://au.yhs.search.yahoo.com/avg/search?fr=yhs-avg&type=yahoo_avg_hs2-tb-web_au&p=
network.cookie.prefsMigrated true
places.last_vacuum 1272511429
print.print_bgcolor false
print.print_bgimages false
print.print_command
print.print_downloadfonts true
print.print_evenpages true
print.print_in_color true
print.print_margin_bottom 0.5
print.print_margin_left 0.5
print.print_margin_right 0.5
print.print_margin_top 0.5
print.print_oddpages true
print.print_orientation 0
print.print_pagedelay 500
print.print_paper_data 0
print.print_paper_height 11.00
print.print_paper_size -134744073
print.print_paper_size_type 1
print.print_paper_size_unit 0
print.print_paper_width 8.50
print.print_printer Lexmark 4200 Series
print.print_reversed false
print.print_scaling 1.00
print.print_shrink_to_fit true
print.print_to_file false
print.printer_Lexmark_4200_Series.print_bgcolor false
print.printer_Lexmark_4200_Series.print_bgimages false
print.printer_Lexmark_4200_Series.print_command
print.printer_Lexmark_4200_Series.print_downloadfonts true
print.printer_Lexmark_4200_Series.print_edge_bottom 0
print.printer_Lexmark_4200_Series.print_edge_left 0
print.printer_Lexmark_4200_Series.print_edge_right 0
print.printer_Lexmark_4200_Series.print_edge_top 0
print.printer_Lexmark_4200_Series.print_evenpages true
print.printer_Lexmark_4200_Series.print_footercenter
print.printer_Lexmark_4200_Series.print_footerleft &PT
print.printer_Lexmark_4200_Series.print_footerright &D
print.printer_Lexmark_4200_Series.print_headercenter
print.printer_Lexmark_4200_Series.print_headerleft &T
print.printer_Lexmark_4200_Series.print_headerright &U
print.printer_Lexmark_4200_Series.print_in_color true
print.printer_Lexmark_4200_Series.print_margin_bottom 0.5
print.printer_Lexmark_4200_Series.print_margin_left 0.5
print.printer_Lexmark_4200_Series.print_margin_right 0.5
print.printer_Lexmark_4200_Series.print_margin_top 0.5
print.printer_Lexmark_4200_Series.print_oddpages true
print.printer_Lexmark_4200_Series.print_orientation 0
print.printer_Lexmark_4200_Series.print_pagedelay 500
print.printer_Lexmark_4200_Series.print_paper_data 1
print.printer_Lexmark_4200_Series.print_paper_height 11.00
print.printer_Lexmark_4200_Series.print_paper_size -134744073
print.printer_Lexmark_4200_Series.print_paper_size_type 0
print.printer_Lexmark_4200_Series.print_paper_size_unit 1
print.printer_Lexmark_4200_Series.print_paper_width 8.50
print.printer_Lexmark_4200_Series.print_reversed false
print.printer_Lexmark_4200_Series.print_scaling 1.00
print.printer_Lexmark_4200_Series.print_shrink_to_fit true
print.printer_Lexmark_4200_Series.print_to_file false
print.printer_Lexmark_4200_Series.print_unwriteable_margin_bottom 0
print.printer_Lexmark_4200_Series.print_unwriteable_margin_left 0
print.printer_Lexmark_4200_Series.print_unwriteable_margin_right 0
print.printer_Lexmark_4200_Series.print_unwriteable_margin_top 0
privacy.clearOnShutdown.cookies false
privacy.clearOnShutdown.offlineApps true
privacy.cpd.cookies false
privacy.item.offlineApps true
privacy.sanitize.migrateFx3Prefs true
privacy.sanitize.timeSpan 3
security.warn_viewing_mixed false
security.warn_viewing_mixed.show_once false
== Firefox version
==
3.6.3
== Operating system
==
Windows XP
== User Agent
==
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 ( .NET CLR 3.5.30729)
== Plugins installed
==
*-getplusplusadobe16249
*Office Plugin for Netscape Navigator
*Adobe PDF Plug-In For Firefox and Netscape
*Default Plug-in
*NPRuntime Script Plug-in Library for Java(TM) Deploy
*The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
*Shockwave Flash 10.0 r45
*iTunes Detector Plug-in
*Garmin Communicator Plug-In 2.8.1.0
*Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
*Java(TM) Platform SE binary
*Next Generation Java Plug-in 1.6.0_20 for Mozilla browsers
*Npdsplay dll
*DRM Store Netscape Plugin
*DRM Netscape Network Object

How do I fix this problem ...javascript (cid) applications.

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

What can I do about this: After upgrading to firefox 6, I get this error. TypeError: Components.classes[cid] is undefined???

What can I do about this:
After upgrading to firefox 6, I get this error.
When I click to open Firefox, A box open with the following error:
JAVASCRIPT Application
TypeError: Components.classes[cid] is undefined?
After I click close on the box, then Firefox will start. I really just want to get the error fixed so that when I want firefox open, I don't have to see this box anymore.

You need to figure out which add-on is causing that error and disable it until the developer of that add-on fixes it. There may be an error message about that in the Error Console, accessed through the Web Developer menu item or through {Ctrl + Shft + J}.
Also see this: 
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes

When I open firefox 4 or a new window I get an error message "components.classes[cid] is undefined" how do I fix this

I upgraded to firefox 4 and now whenever I open the browser or a new window in the browser I get an error message that reads "Components.classes[cid] is undefined. How do I fix this message. I have reinstalled firefox 4 three times and still get the message. I am running windows 7 pro

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
* [[Troubleshooting extensions and themes]]
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
* Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

After downloading 4.0 I get this message: JavaScript application can't create mcafee plug-in object: TypeError: components.classes[cid] is undefined

I finished downloading Firefox 4.o to my Mac OS.X.
When I try to open a website I get the message:
[JavaScript Application] can't create mcafee plug-in object: TypeError: Components.classes[cid] is undefined
If I click the OK button, the site opens, but without the McAfee alert at the bottom of the window.
I had just downloaded 3.6.16, and got box suggesting download version 4.0 for better security, but that seems to be where the problem is!

That indicates that an add-on you are using is not compatible, considering the other errors it is possibly the McAfee add-on. To confirm what add-on is causing this use the procedure in this link - https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

Everytime I open a window in Firefox 4 beta 2 I get a messeage that says TypeError: Components.classes(cid) is undefined, when I click OK it opens up the new window. How can I fix this?

Everytime I open a window in Firefox 4 beta 2 I get a messeage that says TypeError: Components.classes(cid) is undefined, when I click OK it opens up the new window.

Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). 
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]] 
 
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears. 
You can use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions. 
You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

Hi there I have updated to your lates version but every time I open up the browser and new windows I get this error message 'TypeError: Components.classes[cid] is undefined' although it does work but the message is very annoying

Question
Hi there I have updated to your lates version but every time I open up the browser and new windows I get this error message 'TypeError: Components.classes[cid] is undefined' although it does work but the message is very annoying

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

Getting error message when starting Firefox. Msg as follows: TypeError: Components.classes[cid] is undefined (using on Windows 7) Help?

Getting the following error message when I start Firefox. ''TypeError: Components.classes[cid] is undefined''
Do not know where to go to fix this. Running my laptop on Windows 7.

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

Upgraded to FF4, Have windows 7, everytime I click on FF4 to go online, I get pop-up box with error message [Javascript: application] Typeerror: Components.classes[cid] is undefined...when I click OK it lets me online but this is a pain

I get an error message... [Javascript: application] upper left corner in the pop-up box, then in the body of the pop-up box it says, Typeerror: Components.classes[cid] is undefined...when I click OK it lets me online but this is a pain, also, I get the same message when I try to open another window while using FF4...Thanks and hope you can help...

Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]

I have downloaded Firefox 4.0.1. Upon opening the browser, I get the error message, JavaScript Application. Type Error. Components.classes[cid] is undefined Help. Thanks.

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