Why are browsers blocking access to the contact page?

Question

MODX

There is a simple site on the MODX engine, it has a "Contacts" page.
The "Contacts" page has a simple form with two fields (Name, Phone) and a "Call me back" button. The form is made with the FormIT snippet and simply drops the letter on the mailbox.
Suddenly it turned out that the browsers stopped accessing the page and Chrome and Firefox: Your connection is not secure
The owner of ***.ru has configured his website incorrectly. To protect your information from being stolen, Firefox did not connect to this website.
I don’t understand anything, now I have to buy an ssl certificate because of the feedback form? What's the matter?
Hosting Reg.ru.

Answer 1

1. If possible, provide a link to the page.
2. Are you sure that the contact page is not trying to open via https?
3. In reg.ru used to distribute free certificates. If they give it out, take it.

Answer 2

Since one of the recent updates, chrome has been flagging pages that transmit logins/passwords and credit card details as insecure if they are not transmitted via https.
Apparently there is something similar in firelis.
Apparently he took your form just for this.

Answer 3

no need to buy a certificate, there is a free https://letsencrypt.org/
just the other day I set it up, everything is super, the validity period is 90 days, but you can set up automatic reissue