Smoothbox do not work Ubuntu (at least 20.04) with Firefox and Chrome with a https page. In windows works.

[luisgo007]

Mixed Content: The page at 'https://xxxxxxxxx' was loaded over HTTPS, but requested an insecure script 'http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.js'. This request has been blocked; the content must be served over HTTPS.

[luisgo007]

Mixed Content: The page at 'https://xxxxxxxxx' was loaded over HTTPS, but requested an insecure script 'http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.js'. This request has been blocked; the content must be served over HTTPS.

It is working. Sorry. I wanted to delete this post. I put https in http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.js' in index.htm.