pepper flash plugin doesn't do proper fullscreen video

[halfbeing]

The Pepper Flash plugin doesn't do proper full screen video.

Steps to reproduce:
Go to http://www.aljazeera.com/video/
Start the video.
Click on the fullscreen button in the video rectangle.
The video opens in a large window which still has borders etc and which doesn't hide the desktop environment stuff (the XFCE panel in my case), instead of taking over the whole screen. Basic video controls such as play and pause are missing in this window.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: pepperflashplugin-nonfree 1.3ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-24.47-lowlatency 3.13.9
Uname: Linux 3.13.0-24-lowlatency x86_64
ApportVersion: 2.14.1-0ubuntu3.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Mon May 26 03:25:24 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-08-22 (276 days ago)
InstallationMedia: Ubuntu-Studio 13.04 "Raring Ringtail" - Release amd64 (20130424)
SourcePackage: pepperflashplugin-nonfree
UpgradeStatus: Upgraded to trusty on 2014-04-22 (33 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Cattus Niger (javiergomezat)]

I have the same problem in Kubuntu 14.04.

I want to point, I don't know if it's useful or not, that the corners of the "fullscreen" are rounded, I don't know why.

[gdwarf (gdwarf)]

I have the same problem for a long time already.

Ubuntu GNOME 14.04 with GNOME Shell 3.10.4
Linux 3.13.0-29-generic on amd64

Same problem with pepperflashplugin versions 13.0.0.182 and 14.0.0.125