[Feature Request] Show file size and GIF length in popup

[mleyen]

It would be interesting to be able to see the size in kilobytes of the file being viewed, next to the zoom indicator, for example.

Also, when viewing a GIF or GIFV, see the total duration of the GIF(V), if possible.

I have a slow connection so these would help me know why I'm waiting so long for some images to load.