Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

I installed the new update 7.0.1. When I open the program, a small box with an error message pops up: "---------->TypeError: Components.classes[cid] is undefined."

  • 1 reply
  • 4 have this problem
  • Last reply by cor-el

more options

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.

All Replies (1)

more options

This issue can be caused by an extension that isn't working properly.

Start Firefox in Troubleshoot Firefox issues using 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).