pgAdmin won’t start (eternal loading)

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I had the same problem and I resolved it following the steps on link
https://www.pgadmin.org/faq/#12

When I launch pgAdmin 4 v4.28 or later on Windows, the loading page
never closes. Why? pgAdmin 4 v4.28 includes additional security
features, one of which is intended to prevent security issues caused
by Content Sniffing.

Unfortunately some Windows systems are mis-configured such that this
causes Javascripts used by pgAdmin to fail to load. Opening the
developer tools on your browser will show an error similar to this:

Refused to execute script from
‘http://127.0.0.1:57313/static/vendor/require/require.min.js?ver=42800’
because its MIME type (‘text/plain’) is not executable, and strict
MIME type checking is enabled.

(index):39 Uncaught ReferenceError: require is not defined at
(index):39 This will occur when the value of the registry key at
HKEY_CLASSES_ROOT.js\Content Type is set to text/plain. To resolve
the issue, use the Registry Editor and reset the value of
HKEY_CLASSES_ROOT\.js\Content Type to: text/javascript

Finally, restart the pgAdmin server.

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