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"Server not found" on certain websites but they load fine in private mode

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I haven't been able to access Wikipedia or Youtube all week. I only get the "Hmm. We’re having trouble finding that site." Every other website I've tried works fine. But if I try in private mode, Wikipedia and Youtube come up fine as if nothing is wrong, so I think something is up with firefox.

I've been trying to find a solution in other threads. Things I've tried: clearing cookies and site data; disabling all extension; ran a full system scan for malware and viruses. Nothing has worked

Any other ideas?

I haven't been able to access Wikipedia or Youtube all week. I only get the "Hmm. We’re having trouble finding that site." Every other website I've tried works fine. But if I try in private mode, Wikipedia and Youtube come up fine as if nothing is wrong, so I think something is up with firefox. I've been trying to find a solution in other threads. Things I've tried: clearing cookies and site data; disabling all extension; ran a full system scan for malware and viruses. Nothing has worked Any other ideas?

Ausgewählte Lösung

Hello,

The Refresh feature (called "Reset" in older Firefox versions) can fix many issues by restoring Firefox to its factory default state while saving your bookmarks, history, passwords, cookies, and other essential information.

Note: When you use this feature, you will lose any extensions, toolbar customizations, and some preferences. See the Refresh Firefox - reset add-ons and settings article for more information.

To Refresh Firefox:

   Open the Troubleshooting Information page using one of these methods:
       Click the menu button New Fx Menu , click help Help-29 and select Troubleshooting Information. A new tab containing your troubleshooting information should open.
       If you're unable to access the Help menu, type about:support in your address bar to bring up the Troubleshooting Information page. 
   At the top right corner of the page, you should see a button that says "Refresh Firefox" ("Reset Firefox" in older Firefox versions). Click on it.
   Firefox will close. After the refresh process is completed, Firefox will show a window with the information that is imported.
   Click Finish and Firefox will reopen.
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Ausgewählte Lösung

Hello,

The Refresh feature (called "Reset" in older Firefox versions) can fix many issues by restoring Firefox to its factory default state while saving your bookmarks, history, passwords, cookies, and other essential information.

Note: When you use this feature, you will lose any extensions, toolbar customizations, and some preferences. See the Refresh Firefox - reset add-ons and settings article for more information.

To Refresh Firefox:

   Open the Troubleshooting Information page using one of these methods:
       Click the menu button New Fx Menu , click help Help-29 and select Troubleshooting Information. A new tab containing your troubleshooting information should open.
       If you're unable to access the Help menu, type about:support in your address bar to bring up the Troubleshooting Information page. 
   At the top right corner of the page, you should see a button that says "Refresh Firefox" ("Reset Firefox" in older Firefox versions). Click on it.
   Firefox will close. After the refresh process is completed, Firefox will show a window with the information that is imported.
   Click Finish and Firefox will reopen.