One way this might happen is if this second tab is listed along with your regular home page. Although it's often hard to see in the Options dialog due to the short space available, you can have multiple URLs separated by vertical bars (|) and every time you start Firefox or click the Home button, a tab will open for each one. You can manually edit your home page addresses or clear them and start again. Related articles: * [[Startup, home page and download settings]] * [[How to set the home page]]