When I enter any site, including Mozilla, I get a message that says "TypeError: Components.classes[cid] is undefined" I have to "x" that message to enter.
This also applies to opening links within sites. I do this several hundred times a day in my work and it happens every time.
That indicates that you are using an add-on that is not compatible with Firefox 4. For details of how to troubleshoot this to find out what one is causing the problem see https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
Similar Messages
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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 -
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).<br />
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]<br />
<br />
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.<br />
You can use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.<br />
You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")<br /> -
Whenever I click on firefox, or when a pop-up occurs, I get a java script error that says, "TypeError: Components.classes[TvtPwmComponent_CID] is undefined". I don't know why. It first occurred while I was on ESPN while trying to watch college games live.
This issue can be caused by an extension that isn't working properly.
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
Start Firefox in <u>[[Safe Mode]]</u> 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 -
error message when starting Firefox 8 that says:
TypeError: Components.classes[TvtPwmComponent_CID] is undefined
I am using Window 7 64 bitStart Firefox in <u>[[Safe Mode]]</u> 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.com/kb/Safe+Mode
*https://support.mozilla.com/kb/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") -
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]] -
When i start firefox 4.0, i get a javascript application box coming up saying "TypeError: Components.classes[cid] is undefined" then i need to click ok to start firefox. Once okay is clicked, firefox starts immediately.
This issue can be caused by an extension that isn't working properly.
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]] -
It has an OK button. When I click it the program opens.
Why is this? How do I get rid of it?
I have tried deleting, downloading the update again, reinstalling it twice. This didn't help.This issue can be caused by an extension that isn't working properly.
Start Firefox in <u>[[Safe Mode]]</u> 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.com/kb/Safe+Mode
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes -
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.
ThanksStart 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]] -
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 <u>[[Safe Mode]]</u> 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 -
Since installing the newest version of Firefox, This message "TypeError: Components.classes[cid] is undefined" appears in a box when a new window should open. Also, what you see in print print preview is not what prints.
This type of error is usually caused by an add-on you are using that is not compatible. It could be anything from an antivirus link scanner like AVG Safe Search add-on, or McAfee Site Advisor add-on, or something similar. To confirm what add-on is causing this use the procedure in this link:
https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
Try Disabling the last add-on that was installed prior to upgrading to version 5.0
Check and tell if its working. -
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 <u>[[Safe Mode]]</u> 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 -
This is the error message I get when i click to open FF after i downloaded the newest version: "ug-in object: TypeError: Components.classes[cid] is undefined" . The message is in the top left corner and not fully visible. i sent a message a few min ago so i am sending this b/c i copied the error message to help diagnose the problem.
This issue can be caused by an extension that isn't working properly.
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]] -
The following error message came when I tried to open Firefox and install Firefox Home.
"can't create mcafee plug-in object: TypeError: Components.classes[cid] is undefined"This issue can be caused by an extension or plugin that isn't working properly.
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]]
* [[Troubleshooting plugins]] -
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
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