Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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.

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

How to I prevent Firefox from opening a second tab all the time when it starts?

  • 3 cavab
  • 14 have this problem
  • 3 views
  • Last reply by cor-el

more options

When Firefox opens, it immediately opens a second tab that goes to "https://www.mozilla.com/en-US/plugincheck/" My home page, which is Google, is on the first tab. How can I stop this from happening, it never did this before? This just started today.

When Firefox opens, it immediately opens a second tab that goes to "https://www.mozilla.com/en-US/plugincheck/" My home page, which is Google, is on the first tab. How can I stop this from happening, it never did this before? This just started today.

All Replies (3)

more options

See these articles for some suggestions:

more options

I tried all 3 of your suggestions and I still have this problem. I still need help resolving this issue.

more options

This issue was caused by a bug to blocklist plugins and that has been fixed.
You can correct this issue by forcing the file blocklist.xml to update or wait until Firefox updates the blocklist.xml file during the next hours.
That update will remove the severity="0" flags in the file that had caused the problem.

See: