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!

Try the solutions in these threads:

• Gmail is not loading; only showing gibberish
• Gibberish loading on certain websites
• network.http.accept-encoding keeps resetting and won't lock

Thanks. That was very helpful.

A reset is not necessary to fix this issue as it is likely caused by one pref (network.http.accept-encoding) that needs to be reset to its default value on the about:config page.

• http://kb.mozillazine.org/network.http.accept-encoding
• http://kb.mozillazine.org/about:config