Mozilla VPN is currently experiencing an outage. Our team is actively working to resolve the issue. Please check the status page for real-time updates. Thank you for your patience.

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 get this error message when opening Firefox "onload error TypeError: TcFfUpdates.getTcPluginsInstance().getNewExtensionsList is not a function"

  • 3 replies
  • 1 has this problem
  • 11 views
  • Last reply by cor-el

more options

Each time I open Firefox I get the error message. I have unistalled the product, re-downloaded it and installed it with the same results. Otherwise the browser seems to work well.

Each time I open Firefox I get the error message. I have unistalled the product, re-downloaded it and installed it with the same results. Otherwise the browser seems to work well.

Chosen solution

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).

Read this answer in context 👍 0

All Replies (3)

more options

Chosen Solution

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).

more options

Thank you Cor-el - I disabled the "Zone Alarm Security Engine" add-on which seemed to solve the problem.

more options

You're welcome