If you are a Chrome user which I hope you are given of the importance of Chrome, then you will no longer have to paralyse al your Facebook activity to watch a video. Using Facebook Video Player will enable you to both watch a video and scroll down through your Facebook posts.
After you install the add-on and restart your browser. You will see that any video you will play within Facebook will be shifted to the right pane away from the centre posts section.Go ahead and check your posts while the video is up there playing. I think you might be in need of such a tool too. Head over to Chrome store and install Facebook Video Player.