On Youtube you might have to block their cookies. In Web Browser, go to
Edit->Preferences->Privacy.
There you have to "Use custom settings for history" from the upper drop-down
list. Then you'll be able to set which sites are allowed to save cookies.
For FVR: you have to set it up properly. Preferred Method: Embedded.
Plugin/MimeType: WMP. Quality: better lower than higher.
What exactly did you do with gnash? You don't have to install it, it is
preinstalled by default.
Also, html5 does not work in Web Browser before 4.0. You can try installing
Trisquel 5.0 or use the Ubuntu PPA for Icecat.
