What can cause a persistent “Reload the page to get source for” error in firebug?

Question

I\'m trying to debug the javascript of a specific page, and I keep seeing

Reload the page to get source for page.htm in Firebug.

On Chrome, I\'m

Answer 1

For the record, this can also happen if the certificate is jacked for https://www.xyz.com. You need to visit that site first and add a security exception.