This is now what my firefox looks like. I cant access or do anything...

You can delete the prefs.js file to reset all prefs to the default value. You may have to delete the xulstore.json file as well.

• http://kb.mozillazine.org/Resetting_preferences

You can use this button to go to the currently used Firefox profile folder:

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

Thank you so much it works...

You're welcome.

You should always be cautious if you change a pref and make sure that you understand what you are doing. If you want to change the page that opens in as new tab to the home page about:home then you would have to set the browser.newtab.url pref to about:home.

• about:config: browser.newtab.url = about:home

I don't know what went wrong that you ended up with a window that only has the title bar.

See this article about the New Tab page (about:newtab):

• https://support.mozilla.org/kb/new-tab-page-show-hide-and-customize-top-sites

The tab was opening up a weird site and as soon as i saw the first address that matched i went and changed it to open up the default webpage for Firefox.

Don't worry i read it all now carefully and changed the correct one for the new tab.

Thanks again for the help.