hello everyone, i have problems with facebook videos

Información de la versión
Versión: 53.0.2907.68 - Opera se encuentra al día
Flujo de actualización: Stable
Sistema: Debian GNU/Linux 9 (stretch) (x86_64; KDE)

in other navigators theres no problem but in opera still i try to use GNASH, intead of Adobe Flash Player and the problem continues, so i get back to ADOBE FLASH PLAYER... and y install the extensions, i try to use RENDER VIDEOS on Opera: Flag and was useless...

english is not my native language, so if some body can help me i will be very gratefull