How to check XHR that sends to get dynamic content on a website?

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Hello. I need to find the JSON version of a site to do the scraping of a site in Python: http://divulgacandcontas.tse.jus.br/d...

I've been informed that the JSON site is this: http://divulgacandcontas.tse.jus.br/d...

In Firefox, I clicked on Inspect element on the first site above. Then on the Network tab. Then I selected XHR

Please, can I do the same on Wireshark? What are the steps?

I need to check which XmlHttpRequests sends to display dynamic data on a website