pxgator wrote:from the terminal: sudo apt-get iceweasel
That should solve your problems
No, it doesn't. Iceweasel (now Firefox-ESR) cannot play video streams fluently.
Chromium-Browser (from kusti8's repository) could do that, if you set a certain flag (disable media source API). Unfortunately this flag has vanished in version 51. But if you revert to an earlier version (50 or 49) it would work.
Webkit based browsers (kweb, Midori, Qupzilla) can display web video fluently in low resolutions (the typical 360p youtube video, for example).
All this applies only to the RPi 3.
Only browsers using the webkitgtk3 engine (epiphany, kweb3) can use the GPU for video decoding, but this engine (with a lot of patches by the collabora developers, paid for by the Foundation) is really unstable.
The OP's application looks like something he created himself. The kweb package offers options for developers to create embedded web applications which use video in overlay mode (displayed by omxplayerGUI) in any resolution. It looks like they are part of the web page.
For more details you need to read the latest omxplayerGUI manual (the developers chapter).