You can use the SearchReset extension to reset some preferences to the default values.

• https://addons.mozilla.org/firefox/addon/searchreset/

Note that the SearchReset extension only runs once and then uninstalls automatically, so it won't show on the "Firefox > Add-ons" page (about:addons).

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/Tools > Add-ons > Appearance).

• Do NOT click the Reset button on the Safe Mode start window.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

If you do not keep changes after a restart or otherwise have problems with preferences, see:

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

Is there a way to control the webpage that new tabs start at?

See this conversation Apple discussion and run an antivirus scan with Clamxav Did this fix your problems? Please report back to us!

You can set via the browser.newtab.url pref on the about:config page which page will open in a new tab.

• http://kb.mozillazine.org/about:config

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

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

Thanks. I have got as far as finding browser.newtab.url, but how exactly do I set what a new tab's url will be?

I replaced about:newtab with google.com, but the Bing page still opens every time I open a new tab. What step am I missing?

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

Thank you.

Di you try Safe Mode as suggested above?

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

I was going nuts as well but I just figured out the easiest way to fix this. Follow these directions below.

Go to address bar and type in this below, about:config

click "I'll be careful i promise" message.

Scroll down and find this setting below and double click on it,

browser.newtab.url

Next type in your choice of home page, mine is www.google.com

click ok.

you don't need to restart browser, try clicking on a new tab and watch it work..