include flash player in the build
Just like Google Chrome it will be great to have flash player in the installation package...life will be much easier as flash is making some serious issues with online streaming
@ali001985 Vivaldi (unlike Google) cannot afford a license agreement with Adobe for Flash.
But it is easy enough to do it yourself (especially on Windows)
If you are having problems with viewing videos, it is better to check existing threads (most problems are codec or hardware acceleration related).
If that doesn't help; create a new thread yourself - be sure give enough information to allow others to try it themselves.