That's a pretty weird address!

(1) If it only shows up immediately after you submit a search in Firefox's address bar, check this article to switch your search site to something more useful: Change your default search settings in Firefox.

(2) Does this same message show up if you launch a new window using Ctrl+N? If so, it may be embedded in your home page setting. Check this article for more information on how to fix that: How to set the home page.

(3) If it only shows up at startup, one trick that malware can use is to add URLs to your shortcut you use to start Firefox. To check that, either:

• Right-click a Firefox desktop shortcut, then click Properties
• Right-click a Firefox icon pinned to the Taskbar, then right-click Mozilla Firefox, then click Properties

Windows should show the Shortcut tab and select the Target field. The Target usually is along the following lines:

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

If there is anything extra after that which you did not put there, you can remove it.

Was the problem one of those things?

I also wouldn't rule out the possibility that the problem is outside Firefox -- your connection being intercepted and redirected by a proxy server or malware.

(4) Set Firefox not to use any system-level proxy server. Open the Settings page using either:

• "3-bar" menu button (or Tools menu) > Settings (previously "Options")
• type or paste about:preferences into the address bar and press Enter to load it

In the very tiny search box at the top of the page, type proxy and Firefox should filter to the "Network Settings" section.

Click the Settings button, select "No Proxy" near the top of the dialog, and click OK near the bottom of the dialog.

Any difference?

(5) Scan for malware. The following support article lists free (or free trial) cleaning tools that other Firefox users have found helpful: Troubleshoot Firefox issues caused by malware.

I downloaded one of the malware cleaning tools that you linked to me and it worked! Thank you so much for your help!