Everytime I open Firefox 5, a window pops up that says,"TypeError: Components.classes[cid_siterank] is undefined,"with an ok button on it. I want this box to disappear.

Everytime I open Mozilla Firefox 5 Beta, a window pops up that says, "TypeError: Components.classes[cid_siterank] is undefined," with an "ok" button, after I click ok, it opens firefox, how do I stop this window from appearing everytime I open firefox? It never did this with previous versions of firefox.

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
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")
In Firefox 4+ you can use one of these to start in [[Safe mode]]:
* Help > Restart with Add-ons Disabled
* Hold down the Shift key while double clicking the Firefox desktop shortcut (Windows)
* https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

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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")

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

When I click on firefox I get a java script error that says "TypeError: Components.classes[TvtPwmComponent_CID] is undefined", what does that mean?

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 [[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

Error message when starting Firefox 8 that says: TypeError: Components.classes[TvtPwmComponent_CID] is undefined

error message when starting Firefox 8 that says:
TypeError: Components.classes[TvtPwmComponent_CID] is undefined
I am using Window 7 64 bit

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
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")

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. Whats going on??????

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]]

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

When i am open a new window every time it showing TypeError: Components.classes[cid] is undefined

Q . TypeError: Components.classes[cid] is undefined. this create problem for me every time , so please help me to solve this problem.

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

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

After the latest update for firefox, now when I start firefox up I keep getting a pop up window that is a Java Script Application that says TypeError:Components.classes['@softage.ru/skype/skypeFfExtension;1']is undefined.

After closing this Firefox seems to work fine but this happens everytime on startup. How can I get rid of this pop up window starting everytime? Can I re-install firefox? Would I lose my bookmarks etc?

Once I disabled my Ask.com toolbar (that was installed when I installed FoxIt), the error went away.

Suddenly every time I try to open firefox, I get this error: TypeError: Components.classes[cid_siterank] is undefined

it will load after I x it out, but when I open hotmail, it loads, and reloads, and acts as though it has a virus. in the address bar a message keeps flashing saying something about javascript. I've tried everything.

cor-el is correct. I confirmed this myself. Has nothing to do with Add-ons. It happened on a brand new laptop with no add-ons installed.
It is a bug that needs to be squashed ASAP.

Error message when opening FF: can't create mcafee plug-in object: TypeError: Components.classes[cid] is undefined

I can click ok and firefox will open, but it's still odd... I get the same message when opening any kind of pop-up window.

This issue is most likely caused by a McAfee extension that isn't working properly and you will have to disable the extension that causes it.
You can also check if there is an update available from McAfee that fixes this problem.

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

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]]

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

Everytime I open Firefox 5, a window pops up that says,"TypeError: Components.classes[cid_siterank] is undefined,"with an ok button on it. I want this box to disappear.

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