By opening Firefox I get since recently the message: [JavaScript-toepassing] TypeError: Components.classes[cid] is undefined
After clicking [OK] in the Error-message Firefox runs without problems. It seems to be only annoying.
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
Similar Messages
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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 seem to have screwed up my Firefox, I guess. Whenever I go out of Firefox and try to come back in, I get that message, I click on OK and everything is fine again until I close our Firefox and try to return... What's the problem?
Usually caused by an incompatible extension.
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes -
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 -
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]] -
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 -
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]] -
I wanted to install the Google toolbar extension, so I installed Add-on Compatibility Reporter 0.9.2. Then I installed the Google toolbar extension. When I restarted my computer I got this message. The Google toolbar did not work, so I disabled it thinking that would correct the problem. How can I get back the ability to print webpages. Thanks
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 -
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
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Is this an error in FireFox or JavaScript
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 -
In addition to the error message upon startup, the Enter key does nothing when I type a URL in the search bar; I have to click on the green arrow everytime to navigate to new pages. My about.home page is also empty when the program starts except a blank search bar in the center with no text anywhere around it. I installed 4.0 twice to see if that would fix the problems, but it didn't.
Usually caused by an incompatible extension.
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes -
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: <br />
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes -
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 /> -
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.
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