v1.7.3
New: fullscreen button. The video fills the screen — and shows the whole frame, not the cropped version you see in the feed.

Loop button fixed. It kept losing to Instagram's own looping, so turning it off did nothing. It holds now, and starts switched on for videos Instagram already loops.

Speed picker. Stays over the video, and closes when you move away from it.

• Arrow-key seeking: with the pointer over a video, press the right or
  left arrow key to jump 2 seconds forward or back. It only acts on the
  video you're pointing at, so nothing happens to the other videos on the
  page, and it stays out of the way while you're typing a comment.

• More breathing room between the volume icon and the time display — the
  muted speaker icon in particular used to sit almost flush against it.

• The progress bar now shows how far you've watched — the part you've
  already seen is filled in white, so you can tell your position at a
  glance instead of hunting for the round handle.

• The control bar no longer stays on screen after you click through to
  another page. It used to hang around for a couple of seconds, floating
  over whatever you opened next.
• The small round handle on the progress and volume sliders now sits
  properly centred on its line, instead of slightly too high.
• On Firefox, the volume slider now shows how loud it's set, the same way
  it already did on Chrome.

Bug fixing on post with carousel

Better interface, instead a floating panel the video controls now at the bottom of the video.