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missing I understand Risk Button

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When I open my server's url so got error in firefox 31 "The certificate is not trusted because it is self signed” error and missing button is : I understand Risk But other's pc in it is wok fine.

When I open my server's url so got error in firefox 31 "The certificate is not trusted because it is self signed” error and missing button is : I understand Risk But other's pc in it is wok fine.

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Update to Firefox 32.0.2 and see if it appears. The new "certificate" feature that was added in Firefox 31 was improved in Firefox 32.