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!
All Replies (2)
Start Firefox in Diagnose Firefox issues using Troubleshoot 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
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
- "Java console" needs to be updated as reported in
- "HP Smart Print 1.0" as reported in
- "McAfee Site Advisor" as noted in (also see Problematic extensions above)
- 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)
- various extensions/applications but is 1 year back and Firefox 3.6.6
If none of the above solve you problem use diagnostic approach...
Athraithe ag David McRitchie ar