I assume clicking the Home icon on the Firefox toolbar gives you your normal home page?

If your home page is not what you want:

Try the steps in either of these articles to update it:

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

If your home page is okay and the problem continues:

Problems with your Firefox shortcut can be investigated as follows:

• Desktop shortcut: right-click the icon, choose Properties
• Pinned taskbar icon: right-click the icon, right-click Mozilla Firefox, choose Properties

Windows normally will select the Shortcut tab. If not, go ahead and click the Shortcut tab.

The Target line should not have anything after this part:

• 32-bit Firefox on 64-bit Windows: "C:\Program Files (x86)\Mozilla Firefox\firefox.exe"
• Otherwise: "C:\Program Files\Mozilla Firefox\firefox.exe"

If anything is listed after that, clear it out and save your change. To test, you can either:

• Desktop shortcut: double-click the icon to launch a new window
• Pinned taskbar icon: right-click the icon, click Mozilla Firefox to launch a new window

If you get your home page, it worked.

Oh, I should mention that this sounds rather malware-ish. You might also want or need to do more to prevent it from recurring and check for other issues.

Here are the two main things:

(1) Open the Windows Control Panel, Uninstall a Program. After the list loads, click the "Installed on" column heading to group the infections, I mean, additions, by date. This can help surface undisclosed bundle items that snuck in with some software you agreed to install. Be suspicious of everything you do not recognize/remember, as malware often uses important or innocent sounding names to discourage you from removing it. Take out as much trash as possible here.

(2) You can supplement your regular security software with the "one-time" or "on-demand" scanning/cleaning tools listed in our support article: Troubleshoot Firefox issues caused by malware. These scanners are free and may have a different take on unwanted software than your regular program.