skipping through videos using browser?

[Mikemix]

Sometimes there are YouTube videos that cannot be seen via the app or you are trying to view a video on your browser. While most of the time I am able to play the video within the browser, I find it impossible to skip through the video timeline. How can I grab the timeline to skip ahead to a certain part of the video, keeping in mind I am trying to do it through the stock browser or dolphin? Thanks!!!