How to find which element breaks HTTPS on a web page?

Question

Is there an easy way, perhaps through the firefox plugin or something else, to find out which element of the webpage is breaking the HTTPS connection?

I searched the source for any "http" and did not find it. I think the root of the problem lies somewhere in the javascript file, but I was hoping to reduce it easier than going line by line through all javascript files.

Any simple solution or suggestions?

Answer 1

I do not know about firefox, but Google Chrome shows all insecure content sources in the console.

For example:

The https://mail.google.com/mail/u/0/?shva=1#inbox page displays insecure http://example.com content.

Etc.