How can you tell exactly what insecure items are causing a browser to warn about mixed secure and insecure items?

Question

In Firefox, I view my site and get no warnings about insecure mixed content.

Using FireBug, I can see that every request is https.

In Chrome, I

Answer 1

Open up the Web Inspector and find the yellow triangle (warning) in the top right. Click on it and it will display all security issues.