How to complete the DS-160 when "Session timed out"

I tried using the latest versions of safari and firefox (mac).

Everytime I try to complete the DS-160 I get a "Session timed out" error.

I can use my application number to login again, but I get a "session timed out" before I can send any new informations.

How to complete my DS-160 application ?

To clarify: Talking about the form on this page https://ceac.state.gov/genniv/

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Can I complete DS-160 after scheduling appointment?

The DS-160 must be completed and submitted online prior to your interview at the U.S. Embassy or Consulate.

How long does it take to complete ds160?

Applying for Form DS-160 is done electronically through the U.S. Department of States Consular Electronic Application Center. To fill out the entire fill will take around 90 minutes, and you can have other people assist you, such as a qualified immigration expert.

Which browser is best for DS-160?

Browser requirements:DS-160 on line form is best supported by Internet Explorer 11 or higher and Google Chrome 58 or higher. Safari is not supported.

How do I fix my session timed out?

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Images: Thirdman, Anna Tarazevich, Anna Tarazevich, Castorly Stock