Enable Developer Toolbar in Chrome/Firebug bar in Firefox.
Click on Console.
It will show error details like this:
Mixed Content: The page at 'https://pinger.droidzone.in/' was loaded over HTTPS, but requested an insecure image 'http://i.creativecommons.org/l/by-nc-nd/3.0/80x15.png'. This content should also be served over HTTPS. https://pinger.droidzone.in/:132
Joel G Mathew, known in tech circles by the pseudonym Droidzone, is an opensource and programming enthusiast.
His favorite pastime is grappling with GNU compilers, discovering newer Linux secrets, writing scripts, hacking roms, and programs (nothing illegal), reading, blogging. and testing out the latest gadgets.
When away from the tech world, Dr Joel G. Mathew is a practising ENT Surgeon, busy with surgeries and clinical practise.