You did not list your extensions. Some extensions may provide information when you update them, or when Firefox updates. I would normally anticipate that if you then close that tab it will not reopen again unexpectedly. Please list *all your extensions as shown in the troubleshooting page. Paste the content in to your next message. **see [[Use the Troubleshooting Information page to help fix Firefox issues#w_copy-to-clipboard]]'''_copy-to-clipboard''' * the extensons that cause this problem