Without this extension, for example, when you click through YouTube videos, back and forth, they always start from the beginning, even those, you left watched half way through. No more. With this extension, previously watched videos will resume from where you left them at. Even if you restart your browser.
Version 1.2.1, 1.2.2 fix playback issues with updated YouTube interface.
Version 1.2.0 brings additional options, such as considering a video finished if only a few seconds remain on it and expiring older videos.
Version 1.1 and up now handles YouTube videos, posted on other websites.