When I start Firefox, Iget the following message "TypeError: Components.classes[cid] is undefined"

TypeError: Components.classes[cid] is undefined. This is the message thast pops up every time I start Firefox.

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 [[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

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When I launch Firefox 4.0 I get the following message "TypeError: Components.classes[cid]is undefined. How do I fix this?

When I click "ok" the pop up window clears and FireFox opens. I believe this error is also preventing Privacy Protect from activating in FireFox.

This is probably due to 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

Every time I start Firefox I get : JavaScript Application TypeError: Components.classes[cid] is undefined. What causes this and how do I fix it?

This happens also when I open another tab that requires printing.

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]]

Since installing Firefox 4, I keep getting this message "TypeError: Components.classes[cid] is undefined" when a window should open. Also print and print preview don't work properly anymore.

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.

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

I install compatibility reporter in my Mozilla firefox 5 running under Windows 7 and get message - TypeError: Components.classes[cid] is undefined, what is causing it please?

I am having to install Compatibility reporter so that Google toolbars will work. This used to be ok, but now I am getting the message-TypeError: Components.classes[cid] is undefined. I am running under Windows 7 any idea how |I can get round it please?

If you force an extension to install by overriding the compatibility then the result can be unpredicted. 
The extension may work or may not work or cause error messages like you posted. 
You always need to be careful with forcing extensions to install.
You may need to check extensions.checkCompatibility prefs on the about:config page.
* http://kb.mozillazine.org/extensions.checkCompatibility

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

I receive the following error message "TypeError:Components.classes[cid] is undefined

Every time I click on a web page the following message appears
Type Error:Components.classes[cid] is undefined
== This happened ==
Every time Firefox opened
== Few weeks ago

This is caused by an extension. Possibly AVG or "eSnips Download Helper".
See [[Troubleshooting extensions and themes]] for how to disable all extensions, and enable them one by one to find the problematic one.
See also this thread: https://support.mozilla.com/en-US/forum/1/258251

When i log in to firefox i get the message TypeError: Components.classes[cid] is undefined do you know how to get rid of it

this only started after i reinstalled google toolbar

This issue can be caused by an add-on 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 get message "TypeError: Components.classes[cid] is undefined" when opening and some web sites andd I have to cancel or close to continue.

Top of error box JAVAScript application
i have downloaded most recent Java but it problem continues.

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 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

Error message TypeError: Components.classes[cid] is undefined

when starting Firefox 5 in Vista. I get the above error message. Have looked at the favourite solution for this and have tried disabling all add ins one at a time to no avail. It will start ok in safe mode. Does anybody have any other suggestions

This issue can be caused by an add-on 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 reinstalled hoping it would get rid of the error message that pops up each time i open it TypeError: Components.classes[cid] is undefined

When I open up Mozilla i get this error message--TypeError: Components.classes[cid] is undefined
also when i am working on my real estate web site and pull up a name i get the same messag. At the top it always says-- Java Script Application

That error is caused by an incompatible/malfunctioning add-on. To identify the culprit follow the procedure in the [[troubleshooting extensions and themes]] article. One add-on that has caused this error for some is AVG safe search.

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

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"

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]]

IGet this message when I start firefox, TypeError: Components.classes[cid] is undefined

upgraded firefox a couple of days ago now i get this error message, and the upgrade file starts to download again.
message ; TypeError: Components.classes[cid] is undefined

This type of error is usually caused by an add-on you've installed. It could be anything from an antivirus link scanner like AVG Safe Search, or McAfee Site Advisor, or something similar.
Start Firefox in [[Safe Mode]]. If it functions properly in that configuration, then one of your add-ons is the culprit.
See also [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]

When I start Firefox, Iget the following message "TypeError: Components.classes[cid] is undefined"

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