Allows you to resize the video to a more convenient size
The embedded videos on skillsmatter.com are too tiny to watch comfortably. The only other option is to watch it full screen, which prevents you from working in other windows simultaneously.
This extension adds a slider (somewhere) above the video. Drag it to the right to increase the size of the video (it's in an iframe)
(You could also achieve this with dev tools without this extension)