It's easy to add extra tabs to your set of home pages. You can use the Options dialog to make sure there is only one. These articles point the way: * [[Startup, home page and download settings]] * [[How to set the home page]] Because the space is short, you may want to select the whole home page URL (Ctrl+A) and paste it into a document or into a larger textbox like the one I'm typing in now. You're looking for a vertical bar (|) that is followed by a second URL. ---- If it's not part of your home page setting, the most likely cause for this change is a bad add-on that rode along with some free software. I suggest starting here: Open Windows Control Panel, Uninstall a Program. Click the "Installed on" column heading to group the infections, I mean, additions, by date. This can help in smoking out undisclosed bundle items that snuck in with some software you agreed to install. Take out as much trash as possible here. Then, in Firefox, open the Add-ons page using either: * Ctrl+Shift+a * "3-bar" menu button (or Tools menu) > Add-ons In the left column, click Extensions. Then, if in doubt, disable (or Remove, if possible). Often a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step. Does that shut down the extra tab?