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Don't open youtube

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Clear cash and kuki. This not helped

Clear cash and kuki. This not helped

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I think you have an issue with proxy settings. To solve the problem you may try the following fix:

  • Click on the 3 bar Firefox menu and click on Options and go to Advanced tab. (or just type/paste about:preferences#advanced in the browser's navigation bar)
  • Go to the Network tab. Then click on Settings button under Connection.
  • On the Connection Settings Dialog box, select Auto-detect proxy settings for this network or Use system proxy settings

I hope your problem will be solved.