Some, not all, YouTube videos show this "film strip" icon in the controls at the bottom.

There is no popup with explanation on hover (like the captions, settings, etc.). Clicking the icon turns it red and the vertical scrollbar disappears.

What does that icon achieve? Why does it show on some YT vids, but not on others? For example this video.

screen shot with icon highlighted

  • added a link to a vid with that icon – teylyn Nov 27 '15 at 7:02
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    That doesn't show for me. Maybe it's a beta feature. – Andrew Lott Nov 27 '15 at 9:57
  • Same here for me as for @AndrewLott I do not see it in that video. – Bradley A. Tetreault Nov 27 '15 at 14:02
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    That button stands out from the others. Are you sure it wasn't added by some extension you may be using? Does it show up on every web browser you use? – Vinayak Nov 27 '15 at 20:42

Yes, as Vinayak has suggested, it's an extension that I did not remember installing. Funnily enough, it does not always show on all videos. Disabling and enabling again seems to make it show on videos that did not show the icon before.

Once showing, click it, it turns red, and then you can use the scroll wheel of the mouse to scroll frame by frame. Here is the link to the extension in the Google Chrome Webstore: Frame Scroll for Youtube

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