Late to the party here, but I'm actually going to say one that's a bit counterintuitive:
Video Speed Controller
It will let you speed up (or slow down) any HTML5 video online (which is most of all videos). This is great because it lets me watch technical talks, conference talks, etc at 2x or 3x speed - I love watching videos to learn things, and so this helps me do that!
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Late to the party here, but I'm actually going to say one that's a bit counterintuitive:
It will let you speed up (or slow down) any HTML5 video online (which is most of all videos). This is great because it lets me watch technical talks, conference talks, etc at 2x or 3x speed - I love watching videos to learn things, and so this helps me do that!