Can you browse to another website at all?

yes I can browse to other websites

I think part of your post cut off... What is the unwanted page that you get?

If you click the Home icon, or pop up a new window using Ctrl+n, do you get the correct home page?

To change your startup setting and/or home page, please see these articles:

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

If you cannot access the Options dialog, perhaps an add-on is interfering. Could you test in Firefox's Safe Mode? That's a standard diagnostic tool to deactivate extensions and some advanced features of Firefox. More info: Diagnose Firefox issues using Troubleshoot Mode.

If Firefox is not running: Hold down the Shift key when starting Firefox.

If Firefox is running: You can restart Firefox in Safe Mode using either:

• "3-bar" menu button > "?" button > Restart with Add-ons Disabled
• Help menu > Restart with Add-ons Disabled

and OK the restart.

Both scenarios: A small dialog should appear. Click "Start in Safe Mode" (not Refresh).

Can you get Firefox working again?

Can you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

• Use a compressed image type like PNG or JPG to save the screenshot
• Make sure that you do not exceed the maximum size of 1 MB

Try this:

• Download the Firefox installer and save the file to the desktop
  https://www.mozilla.org/en-US/firefox/all/
• Start the installation with a double-click on the desktop icon

You can check if you can start Firefox in Safe Mode by holding down the Shift/Options key.

• https://support.mozilla.org/kb/Safe+Mode

Try to start Firefox with the about:blank page by creating a copy of the current Firefox desktop shortcut and add a space and -url "about:blank" to the target field.