If the "Download" button is not visible in the bottom right corner, you can change a Display Mode. To do this, you have to go to Firefox (top left corner) - Add-ons - Extensions - Display Mode: either a Toolbar or Compact Mode. If you choose a Toolbar Mode, you will see the button "Download" at the toolbar, if you choose a Compact Display Mode, you will see the video for download if you press the "Ant" arrow in the top right corner.
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