[操作疑難] Cannot view Facebook comments when accessed from browser

Here's the problem...
Using Android phone and tried to access FB under browsers eg. FF and Chrome, but while I can view the public post, I cannot access the comments...
Instead, clicking on the comments link opens a separate tab with the picture only, nothing else

I remember being able to view the comments long time ago, but since the browser software has been updated I am unable to do that anymore...

Both FF and Chrome behave the same way, ie. unable to view the FB comments (until I access the same page again from a proper PC desktop)

Can someone explain what's going on here?  Does that have anything to do with Java, Flash etc. etc. plugins?