Configuration: openSUSE 13.1 - KDE, NVIDIA Graphics, HDMI output board to monitor …
In VLC and Kaffeine have sound. In browsers (Firefox or Opera) no youtube, no sound …
Someone help me solve the problem?
thank you
Hi,
Did you try installing Xine-browser-plugin? It works. You may choose to install ‘npapi-vlc’ too. Both works in my case 
You could also install pavucontrol (if not installed already) and use it to ensure pulse audio for your browser/apps is configured to provide sound via the browser.
I installed the latest version of Flash Player and stayed with sound in Opera and Firefox … anyway thanks for the suggestions.