Please explain the problem in detail. What happens? What is/are the exact error message(s) ?

You can check the Web Console (Tools -> Web Developer) for messages about blocked content and about the presence of mixed or unsafe content. *https://developer.mozilla.org/en-US/docs/Tools/Web_Console *https://developer.mozilla.org/en-US/docs/Tools/Network_Monitor If necessary use "Ctrl+F5" or "Ctrl+Shift+R" (Mac: Command+Shift+R) to reload the page and bypass the cache to generate a fresh log.