Hello,

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.

It is possible that your security software (firewall, anti-virus) blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.

Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.

See:

• https://support.mozilla.org/kb/Server+not+found
• https://support.mozilla.org/kb/Firewalls

• https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating

Tylerdowner

   It become good but my speed decreased alot . What should i do to increase my speed while using Mozilla Firefox ? 
  And also i have another question , I should do this job every time that i want to use my Mozilla Firefox ? 

If you have a slow internet connection this may make Firefox load pages slightly slower at first because it removes your internet cache. As you visit your favorite websites again this will return to normal.

and no, you don't need to do this everytime Firefox opens, only if there are major problems.

OK . Thanks my friend , your answers are very helpful to me . In this way i don't use chrome as my browser .