Validity of the certificate of security on a Web site

I am looking for help on the validity and security of a Web site.
The page in question is the one that opens when you click the 'Start' button on this page:
https://www.gov.UK/send-VAT-return

When you press the "Start now" button a new tab opens and briefly a green padlock is seen before turning into a gray triangle with an exclamation point.

My questions are:
Is the site secure?
And if that's why I make the gray triangle with the exclamation point?

Thank you very much

You can use the Web Console to examine more closely the problem. Here's how:

Open the Web Console in the lower part of this tab using Ctrl + Shift + k or the menu Developer.

Reload the page without going through the cache (Ctrl + Shift + r, or shift + click the button reload of the address bar).

Look for the red triangles.

As stated in the joint, the site hosting the analytical script uses the algorithm of RC4 encryption, including 36 of Firefox and later treat as unsecure. In a future version, Firefox even will not load the script, so it's something that the site should try to develop with its supplier.

Tags: Firefox

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