Showtime: enable YouTube-style keyboard controls

Use similar controls as on YouTube when watching Showtime (`f` for full screen, `k` to play/pause, `c` for captions, `m` to mute/unmute, `p` to enable/disable PiP, `j`/`l` to go back/skip 10 seconds, left/right arrows for 5 seconds, `0`..`9` for 0% .. 90%)

These are versions of this script where the code was updated. Show all versions.

  • v0.4 21/01/2021 Add picture-in-picture, mute/unmute
  • v0.3 21/01/2021 Add support for arrows to skip/go back 5 seconds, and digits 0 to 9 to jump to 0% to 90%
  • v0.2 20/01/2021 Minor change: renamed two constants
  • v0.2 20/01/2021 Add support for `j` and `l` to seek forward and back by 10 seconds, like on YouTube
  • v0.1 18/01/2021