This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

latest firefox update

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

fire1944fox
fire1944fox
more options

I had a pop stating the latest version of firefox wants to be installed. After it was updated to my desktop PC. Everything was fine until I wanted to open my browser the next day the following message appeared TypeError: Components.classes[cid] is undefined. Is there a way you could assist me in fixing the problem

I had a pop stating the latest version of firefox wants to be installed. After it was updated to my desktop PC. Everything was fine until I wanted to open my browser the next day the following message appeared TypeError: Components.classes[cid] is undefined. Is there a way you could assist me in fixing the problem

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

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

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).