Hi Janine, do these tabs only appear at startup or do they also appear when you open a new window using Ctrl+n or when you double-click the Firefox desktop shortcut a second time?

If they show up with Ctrl+n AND every time you use the desktop shortcut:

You might have accidentally made those tabs your home pages. You can view/edit/reset your home page(s) in the Options dialog. These articles have more information:

• Startup, home page, tabs, and download settings
• How to set the home page

If they show up whenever you use the desktop shortcut:

These pages might somehow have been added to the shortcut's "target". You can check that by right-clicking the shortcut > Properties, then on the Shortcut tab, the Target should be the following with nothing after it:

"C:\Program Files (x86)\Mozilla Firefox\firefox.exe"

If they only show up when Firefox starts up:

Firefox may be set to restore a previous session. Normally this shows windows and tabs from your most recently closed session, so it's strange that you get older ones. If you always want to start with your home page, you can make that change in the Options dialog. This article points the way:

• Startup, home page, tabs, and download settings

Does any of that help?

You can check for problems with the sessionstore.js file in the Firefox profile folder that store session data.

• Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
• http://kb.mozillazine.org/Profile_folder_-_Firefox
• http://kb.mozillazine.org/Multiple_profile_files_created

Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost and you will have to recreate them (make a note or bookmark them if possible).

You can check if you have a user.js file in the Firefox profile folder that sets the browser.sessionstore.resume_session_once pref to true.

• http://kb.mozillazine.org/browser.sessionstore.resume_session_once