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Where is the reset-button to find - it is not in the upper-right ........

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Click the Reset Firefox… button in the upper-right corner of the Troubleshooting Information page.

Click the Reset Firefox… button in the upper-right corner of the Troubleshooting Information page.

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The Reset Firefox button is only available for the default Profile. If you don't see it in Troubleshooting Information you aren't using the default Profile.